It requires energy when a substance must travel against a concentration gradient through the membrane
Macrophages rid the body of worn-out cells and other debris.
Answer:
False
Explanation:
The papillary muscles of both right and left ventricles began to contract shortly before the other ventricular muscles (systole) so that they can take up the slack on the chordae tendineae as the full force of ventricular contractions sends blood against the atrioventricular (AV) valve flaps.
They prevent the backward flow of blood to atria from ventricles. So if they contract after the ventricle systole they would not be able to perform their job.
Since people with HIV have weakened immune systems it would be:
C) People with HIV are unable to fight off these rare diseases.
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