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First Semester: Physiology 1 > Lecture 9: ANS 3 > Flashcards

Lecture 9: ANS 3 Flashcards

1
Q

All parasympathetic preganglionic and postganglionic fibers release

A

acetylcholine

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2
Q

Two different types of Ach receptors found in postsynaptic membranes:

A

nicotinic receptors

muscaninic receptors

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3
Q

Types of muscaninic receptors

A

M1-5

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4
Q

Nicotinic receptor is also an

A
  • Ion channel for Na
  • When open, Na ions flow through down its electrochemical gradient -> a change in membrane potential -> action potential
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5
Q

Mechanism of action for M1

A

Gastric parietal cells -> secretion of Hcl intrinsic factor

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6
Q

Mechanism of action for M4

A

Pancreas -> secretion of pancreatic enzymes and insulin

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7
Q

Mechanism of action for M2

A

In the heart: Sa node

  • K channels open
  • This leads to K efflux, hyperpolarization of plasma membrane
  • Slow rate of depolarization
  • Decrease in heart rate
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First Semester: Physiology 1 (34 decks)

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