Homeostasis Flashcards
At relay …
Synapse + neurotransmitters + diffuse
Detached retina =
Blindness + no connection to optic nerve
Lens/cornea + Sclera…
Focuses light onto retine + white tough outer layer of eye
Osmoregulation is…
Controlling conc of blood
Sensory arc
Receptor SN Synapse RN/CNS MN Effector
In bright light…
Circular muscles contract + radial muscles relax (pupils constrict//less light in)
in dim light…
Circular muscles relax + radial muscles contract (pupil dilate// more light in)
Far away accommodation..
Ciliary muscles contract + suspensory ligaments loosen (more convex)
Near accommodation
Ciliary muscles relax + Suspensory ligaments tighten (less convex)
Vasoconstriction
BV constrict + less blood flow to skin capillaries + less heat loss// for vital organs
- sweat glands = less sweat released + less cooling
Vasodilation
BV dilates + more blood flow to capillaries + more heat loss + sweating//enzymes
Shivering + goosebumps
increase KE + rapid muscle contraction
erector hair muscles contract + trap air + insulation + prevent heat loss
Neurons vs hormones
- Electrical vs chemical
- Fast/short vs slow/long
- Neurones vs blood/plasma
- Specific vs general
Structure of neuron
- Cell body = nucleus + cell m + ribosomes
- Axon = myelin sheath + nerve endings
Adrenaline
- Increases HR + BR
- more oxygen/blood/energy to muscles
- Dilates pupils
