Question

All of the following are true regarding the parasympathethic nervous system's effect on heart rate Except:

a) the neurotransmitter binds to beta 2 adrenergic receptors

b) the neurotransmitter released is acetylcholine

c) the neurotransmitter closes T-type calcium channels and open potassium channels

d) the pacemaker cell hyperpolarize

e) the number of action potential generated by the pacemaker cells decrease

2) loudness of sound is based on

a) how many hair cells are struck by a fluide wave

b) where the fluid wave strikes the organ of corti

c) how far the stereocilia on the hair cells bend

d) the frequency of the fluid waves

e) none of the above

Answer 1

1.The answer is a.

​​In parasympathetic sympathetic acetylcholine relesed binds to the muscuranic receptors and nicotinic receptors.So the given statement the neurotransmitter binds to beta 2 adrenergic receptors.

Nor-adrenaline from sympathetic system binds to beta 2 adrenergic receptors.

2.Thw answer is a

loudness of sound is based on how many hair cells are struck by a fluid wave. The movement of fluid in cochlea bend haircells of the inner ear which triggers the nerve impulses and send to auditory nerve to auditory cortex and brain.Loudness is directly determined by the number of hair cells struck by fluid wave.