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IMF-082-01-0001-en	Why does compartmentalisation let a eukaryotic cell run incompatible reactions at the same time?	Membranes enclose compartments and selective transport preserves distinct ionic, metabolic, and protein compositions in each, so conflicting chemistry can proceed simultaneously.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0002-en	Why is externalisation of phosphatidylserine a meaningful signal?	Phosphatidylserine is normally concentrated on the cytosolic leaflet, so its appearance on the outer surface can mark apoptosis and, on activated platelets, promotes coagulation.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0003-en	What distinguishes channels, carriers, and pumps in moving ions and polar solutes across membranes?	Channels allow rapid flow down electrochemical gradients; carriers bind solute and change conformation for facilitated diffusion or coupling to another gradient; pumps spend chemical energy to move solutes uphill.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0004-en	How do large proteins cross the nuclear envelope, and what makes this transport directional?	Small molecules diffuse through nuclear pore complexes, but large proteins need transport receptors that recognise nuclear localisation or export signals; the Ran guanosine triphosphatase cycle imposes direction.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0005-en	Why can lamin mutations alter both tissue resilience and transcription?	The nuclear lamina supports the inner membrane and nuclear mechanics while also anchoring chromatin and influencing gene expression, so defects cause disorders such as muscular dystrophy, cardiomyopathy, and premature ageing.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0006-en	How do non-membrane-bound condensates such as the nucleolus organise reactions, and what is the risk if they persist?	Reversible phase separation concentrates selected molecules without a lipid boundary; pathological persistence can promote protein aggregation.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0007-en	Free and membrane-bound ribosomes are structurally identical. What sends a ribosome to the rough endoplasmic reticulum?	Signal-recognition particle recognises a signal peptide in the growing polypeptide, pauses translation, and directs the ribosome to the rough endoplasmic reticulum, where synthesis resumes through a translocon.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0008-en	What happens to terminally misfolded proteins in the endoplasmic reticulum, and why does this matter for export?	Quality-control systems return them to cytosol for ubiquitination and proteasomal degradation, called endoplasmic-reticulum-associated degradation, so normally only appropriately assembled cargo exits toward the Golgi.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0009-en	How does the unfolded-protein response try to restore endoplasmic-reticulum homeostasis, and what happens if it cannot?	Sensors reduce general translation, increase chaperone and degradation capacity, and expand the endoplasmic reticulum; if homeostasis is not restored, prolonged signalling promotes inflammation or apoptosis.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0010-en	Why are plasma cells, pancreatic acinar cells, and hepatocytes especially dependent on the unfolded-protein response?	They are secretory cells with extensive rough endoplasmic reticulum, the compartment where secreted proteins fold, so they depend strongly on this response.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0011-en	How can exposure to some drugs change hepatic drug handling at the organelle level?	Hepatic smooth endoplasmic reticulum, which participates in detoxification, expands after some drug exposures, increasing metabolic capacity and sometimes altering drug interactions.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0012-en	How are soluble lysosomal enzymes directed to lysosomes, and what happens when this targeting fails?	Mannose-six-phosphate labels them and receptor-mediated sorting captures them for delivery to endosomal compartments; defective targeting lets the enzymes be secreted while undegraded substrates accumulate inside cells.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0013-en	Why are neurons particularly vulnerable in lysosomal storage diseases?	Neurons are long-lived and cannot dilute stored material through cell division, so undegraded substrate keeps accumulating.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0014-en	How does the mildly acidic early endosome allow receptors to be reused, and what is the alternative fate?	Proton-pump-driven acidification can separate ligands from receptors, so receptors can recycle to restore responsiveness; alternatively they pass to lysosomes, and their degradation limits signalling.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0015-en	How do basal, starvation-induced, and selective autophagy differ in purpose?	Basal autophagy removes damaged components, starvation-induced autophagy recycles nutrients, and selective forms such as mitophagy recognise particular damaged organelles; all deliver cargo in double-membrane autophagosomes to lysosomes.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0016-en	What gives the ubiquitin-proteasome system its specificity, and how does it connect to antigen presentation?	Tightly regulated ubiquitin ligases select substrates for polyubiquitin tagging and degradation; the resulting peptides can enter the major histocompatibility complex class one antigen-presentation pathway.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0017-en	Why does proteasomal degradation matter for cell signalling and the cell cycle, not only for disposal of abnormal proteins?	It controls the levels of short-lived signalling proteins, cell-cycle regulators, and transcription factors, so regulated destruction shapes signalling and cycle progression.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0018-en	How does the structure of the inner mitochondrial membrane enable adenosine triphosphate synthesis?	The highly selective inner membrane, folded into cristae, lets respiratory complexes pump protons across it, and adenosine triphosphate synthase uses the resulting electrochemical gradient.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0019-en	Why do mitochondria depend on protein import despite having their own genome?	Most mitochondrial proteins are nuclear encoded and synthesised in cytosol, so they must be imported through translocases using targeting sequences.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0020-en	Why do mutations in mitochondrial fusion and fission particularly affect brain, nerve, muscle, heart, and retina?	Fusion shares contents and fission supports distribution and removal of damaged regions, so defects hit tissues with high energy demand hardest.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0021-en	What is distinctive about how peroxisomes handle hydrogen peroxide and import their proteins?	Oxidases generate hydrogen peroxide, which catalase converts to water and oxygen; proteins are imported after translation through targeting signals, including some that are already fully folded.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0022-en	How do membrane contact sites correct the idea that organelles are isolated bags?	Closely apposed membranes exchange lipids, calcium, and signals without fusion; endoplasmic-reticulum contacts with mitochondria influence metabolism, mitochondrial division, and apoptosis.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0023-en	How do coat proteins, Rab guanosine triphosphatases, tethering factors, and SNAREs divide the work of vesicle traffic?	Coat proteins bend membranes and select cargo, Rab guanosine triphosphatases help specify vesicle identity, tethering factors capture carriers, and SNAREs drive specific membrane fusion.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending
IMF-082-01-0024-en	What determines whether cellular quality control ends in adaptation or in cell injury?	Integrated quality-control systems distinguish repairable damage from irrecoverable dysfunction; successful compensation yields adaptation, while failure leads to senescence, inflammatory signalling, apoptosis, or necrotic injury.	Integrated Medical Foundations; chapter 82, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: d513cf303392b6880370cc475c70393bdfc8fe118effee7bf8d591d6c70f730a; editorial review pending	imf lang::en chapter::082 module::082-01 review::pending