Answer the following statement(s) true (T) or false (F)
1. The anterior interventricular sulcus marks the division between the atria and ventricles.
2. In an aging heart, the ventricles tend to enlarge due to increased resistance in the blood vessels.
3. The pulmonary circuit is supplied by both the right and the left sides of the heart.
4. The systemic circuit contains oxygen-rich blood only.
5. Blood in the heart chambers provides most of the myocardium's oxygen and nutrient needs.
6. Papillary muscles prevent the AV valves from prolapsing (bulging) excessively into the atria when the ventricles contract.
1. False
2. True
3. False
4. False
5. False
6. True
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Typically, of the 125 ml of plasma filtered per minute, 124 ml/min are reabsorbed
Indicate whether the statement is true or false
An increase in parathyroid hormone levels results in
A. increased rate of bone resorption. B. increased rate of Ca2+ excretion by the kidneys. C. increased rate of vitamin D degradation. D. increased concentration of K+ in the urine. E. decreased levels of blood Ca2+.
Which of the following acts as an ATPase during the contraction cycle of muscle?
A) actin molecules B) troponin molecules C) tropomyosin molecules D) the head portion of the myosin molecule E) the tail portion of the myosin molecule
An important feature of a hypothesis is that it has to be ________.
A. testable B. a known fact C. true D. a widely accepted theory E. false