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erica [24]
2 years ago
14

If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________

. A) threshold is reached more quickly and heart rate would increase B) potassium channels compensate and no change in heart rate would occur C) heart rate would decrease, but blood pressure would rise due to the excess sodium present D) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
Biology
2 answers:
Inga [223]2 years ago
4 0

Answer:

The answer is A.

Explanation:

The permeability of the pacemaker cell's membrane is the factor that controls the density of the materials inside the cell which also includes sodium and that controls the neurons and muscles. So if we were able to artificially alter the pacemaker cell's membrane parmeability, for the heart it would result in a quicker satisfaction of the threshold value and therefore would increase the heart rate.

I hope this answer helps.

Irina18 [472]2 years ago
3 0

Answer:

A,

Explanation

Increase membrane permeability  to rapid  sodium influx  leads   to  fast depolarization.With continuous rapid opening now ,  threshold  will be reached onetime.

Hence  fast  propagation of action potential occurs . since reploarization and refractive period now shortened, due to increase  rate of depolarization .Rapid action potential will be propagated and transmitted in  the  cardiac cells. Leading contraction rapid  systolic  contraction.

Increase in sodium  ion concentration in the cardiac cells  leads to retention of fluids( the high solute potential draws water in from surrounding tissues and plasma by osmosis) in the  cardiac muscles cells. <em>This leads to increase in blood pressure, and the  increasing after load leads to rapid heart rate.</em>

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Answer:

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A client has been diagnosed with gram-negative pneumonia. Knowing this bacteria has a lipopolysaccharide endotoxin on the outer
agasfer [191]

Answer:

The options

A)Damage to cellular mitochondria

B)Increased ATP levels

C)Activation of the p53 protein

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The CORRECT ANSWER IS D

D)Apoptosis

Explanation:

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Answer the following using directional terms specific to the dentition. a Your canine is _______________________________________
Ratling [72]

Answer:

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Explanation:

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Distal is the backside of a particular tooth in dentistry. The cheek side of the tooth known as the facial surface for the front teeth in dentistry. Lateral incisors are distal to the central incisors. Lingual is the part of the tooth near the tongue. The chewing surface of posterior teeth is also known as the occlusal.

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eimsori [14]

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<u></u>

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learn more about embryogenesis here: brainly.com/question/26087722

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