PHYL2001 Study Guide - Final Guide: Sensory Nerve, Skeletal Muscle, Homeostasis
PHYL2001: Revision CNS 3
Homeostasis:
= Maintenance of a relatively stable internal environment !
-e.g. Temperature!
-[O 2]!
-pH!
-levels of nutrients!
-waste products & electrolytes (especially Na, K, Cl), too much Cl die (coma)!
Why?
Want to maintain body within narrow requirement for life - stable internal environment!
-Cells can’t live in wildly fluctuate environment!
End point is homeostasis
-we have that most of the time!
-Picked up by sensory nerves/cells (receptors)!
-to integrator (brain), activates some effector !
-= compensatory response (Processes activated by efferent nerves and hormone
systems) !
--> homeostasis!
Afferent = sensory nerves, bring in info from body senses to brain!
Efferent = somatic and autonomic!
Somatic !
= voluntary skeletal muscle contraction (apart from diaphragm, -> voluntary to conscious)!
Document Summary
= maintenance of a relatively stable internal environment. Waste products & electrolytes (especially na, k, cl), too much cl die (coma) Want to maintain body within narrow requirement for life - stable internal environment. Cells can"t live in wildly uctuate environment. We have that most of the time. = compensatory response (processes activated by e erent nerves and hormone systems) A erent = sensory nerves, bring in info from body senses to brain. = voluntary skeletal muscle contraction (apart from diaphragm, -> voluntary to conscious) Cell body with metabolic machine, axon long tube. Lots of ion channels to allow ap/electrical messages to start at the hillock area. Then activate end plate region releasing nt. Similar but has 2 in a row. Cell body of rst neutron (preganglionic) in cns, synapse with post ganglionic (many synapse = ganglion) Cause nt to release to cell body of next neuron. Activate 2nd messenger, etc, then a ect target cell.
