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In a 1929 paper defining physiological homeostasis, Walter Cannon stated the four postulates below. Some systems of the body are under antagonistic control. The nervous system has a role in preserving the fitness of the internal environment. One chemical signal can have different effects in different tissues. Some systems of the body are under tonic control. Choose to answer only one of the following questions. Which postulate applies most closely to the concept that multiple receptors exist for a given ligand? Explain your answer using examples as needed. Which postulate applies most closely to the effects of glucagon and insulin? Explain your answer using examples as needed.

Which clotting factor, when activated, converts prothrombin to thrombin?

Which of the following is true regarding sperm?

What enzyme is involved in all of the following functions? Water production for the anterior segment of the eye. Bicarbonate production in erythrocytes. Bicarbonate production in the pancreas. Hydrogen ion production by parietal cells of the stomach. Hydrogen ion production in cerebrospinal fluid. Carbon dioxide production in certain plants.

In the pregnant woman, what organ takes over secretion of estrogens and progesterone after her corpus luteum degenerates?

Which of the following enhances oxygen unloading from hemoglobin?

Which of the following would result in passive immunity?

Which of the following uterine events occurs during days 15-28 of the menstrual cycle?

What effect would hypernatremia have on the resting membrane potential (RMP)?

Which of the following would apply to an immune response caused by a vaccine? This question has more than one correct answer. You must choose the correct answer to get credit.