The perivascular feet of the <u>endothelial cells</u> help create a blood-brain barrier.
<h3>What are endothelial cells?</h3>
Endothelial cells can be defined as those type of cells found in the inside lining of blood vessels, lymph vessels, and the heart.
Interestingly, the major function of the edothelial cells is that they release substances that control vascular relaxation and contraction as well as enzymes that control blood clotting, immune function and platelet (a colorless substance in the blood) adhesion.
So therefore, the perivascular feet of the endothelial cells help create a blood-brain barrier.
Learn more about endothelial cells:
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B . By altering the enzyme's shape and structure due to a change in its optimal pH.
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Answer:
The muscle is muscle B to bend the hand at the wrist joint
Muscle A must relax to straighten the arm
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Endorphins are chemicals primarily produced in the <u>hypothalamus</u> and <u>pituitary glands</u>... Apparently can also come from other parts of the body as well. They help to relieve pain or stress, and boost happiness.
Causes of Production:
The well-known "runner's high" that is felt after lengthy, vigorous <u>exercise</u> is due to an increase in endorphin levels. Key word: <em><u>exercise</u></em>
