smooth muscle

Question 1

what classification are receptors for the neurotransmitter acetylcholine?

Answer 1

cholinergic

Question 2

what are the two major classes of cholinergic receptors?

Answer 2

nicotinic and muscarinic

Question 3

what type of receptor is the soma of postganglionic neurons of both sympathetic and parasympathetic neurons?

Answer 3

Nicotinic receptors

Question 4

effector organs of the parasympathetic N.S have what type of receptors

Answer 4

muscarinic

Question 5

what is pharmacology?

Answer 5

scientific study of the action of drugs on living systems

Question 6

what is the role of an agonist substance?

Answer 6

they bind to the receptor and mimic the effect of autonomic N.S

Question 7

what is the role of antagonist substance?

Answer 7

binds to receptor and inhibits the action of the agonist

Question 8

characteristics of multi-unit smooth muscle

Answer 8

1. each fiber operates independently (one neuron -> per fiber)
2. dont have inherent rhythmicity
3. controlled almost entirely by autonomic NS

Question 9

Characteristics of Visceral smooth muscle

Answer 9

1. occurs in large sheets (walls of organs) bound tightly via gap junction

Question 10

define inherent rhythmicity

Answer 10

ability of muscle to contract spontaneously without stimulation from nervous system

Question 11

Tonus definition

Answer 11

tentanus of smooth muscle needs a frequency of stimulation much less than skeletal muscle.