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aivan3 [116]
3 years ago
13

In an experiment on synaptic transmission, a synapse was bathed in a Ca+2- free medium that was otherwise equivalent to extracel

lular fluid. An action potential was triggered in the presynaptic neuron. Although the action potential reached the axon terminal at the synapse, the usual response of the post synaptic cell, did not occur. What conclusion would you draw from these results? Explain your answer.
Biology
1 answer:
castortr0y [4]3 years ago
4 0

Answer:

Response of the postsynaptic cell is dependent on the neurotransmitter release

Explanation:

Calcium (Ca2+) is essential for the propagation of the action potential since it is required for neurotransmitter release. When an action potential reaches the end of an axon, voltage-dependent Ca2+ channels open and Ca2+ ions bind to regulatory proteins, thereby initiating the release by exocytosis of neurotransmitters contained in the presynaptic vesicles at the synapse and modulating the transmission of a signal to another neuron (i.e. the postsynaptic site).

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2 years ago
A patient has a an end diastolic volume of 125mL. A heart attack has weakened her left ventricle so it can pump a stroke volume
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The patient's end-systolic volume will be 85 mL

Explanation:

The end-systolic volume (ESV) is the amount of blood present in the ventricle at the end of a ventricular contraction or a systole and at the beginning of a diastole or ventricular expansion.

Throughout the cardiac cycle, the lowest blood volume will be the ESV.  

ESV is a clinical cardiac marker and reflects function of the ventricular ejection or cardiac emptying and systolic function.  

During a heart attack, the stroke volume will decrease due to inefficiency of the heart muscles to pump more blood.

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The end-diastolic volume (EDV) is the amount of blood at end of diastole and beginning of a systole.

The formula for calculating stroke volume SV= EDV-ESV

In the above case the SV is 40 mL and the EDV is 125 mL

Substituting in the above formula ESV = 85 mL

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