Question

In: Anatomy and Physiology

The depolarization of an axon is the result of the __________ of __________ ions. outflux/Na+ outflux/K+...

The depolarization of an axon is the result of the __________ of __________ ions.

outflux/Na+

outflux/K+

influx/K+

influx/Na+

uptake/neurotransmitters

Which type of receptor cell is responsible for transducing pain stimuli?

nociceptor

mechanoreceptor

photoreceptor

thermoreceptor

Glucagon is secreted by the beta cells of the pancreas and causes an increase in blood glucose.

True

False

The effects of the sympathetic and parasympathetic fibers are cooperative in the…

reproductive system

cardio-vascular system

eyes

heart

The dark current of the retina refers to…

inhibition of inhibitory NTs

inhibition of excitatory NTs

Of the following neurotransmitters, which are not stored in vesicles before release by the presynaptic axon?

Amino Acids

Monoamines

Endocannabinoids

Acetylcholine

Polypeptides

excitation of inhibitory NTs

excitation of excitatory NTs

Solutions

Expert Solution

Ans.1. Option D is the correct answer.

EXPLANATIONS:- The depolarization of the axon occurs due to the influx of the Na+ and the reflux of the K+ ions. Due to the depolarization process the membrane potential changes from -70mV to positive membrane potential.

Ans.2. Option A is the correct answer.

EXPLANATIONS:- Pain stimuli are perceived by the nociceptors. They are the specialized peripheral sensory neurons.  

Ans.3. The given statement is false statement.

EXPLANATIONS:- Glucagon is secreted by the alpha cells of the islets of Langerhans. Glucagon converts the glycogen into glucose. So it increases the blood glucose level.

Ans.4. Option A is the correct answer.

EXPLANATIONS:- The sympathetic and parasympathetic nerve fibres are cooperative in the reproductive system. They cooperate to do a bigger function coordinately. During the reproductive event both the system work together.

Sydney Mullin answered 1 year ago
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