Discuss the location and function of valves in the heart
What will be an ideal response?
Right and left atrioventricular valves, present between the atria and ventricles, prevent the backward flow of blood into the atria when the ventricles contract. One semilunar valve is located between the left ventricle and the aorta while another semilunar valve is situated between the right ventricle and the pulmonary trunk. These semilunar valves prevent the backward flow of blood from the pulmonary trunk and aorta into the ventricles when the ventricles relax as a result of higher pressure in the arteries and gravity.
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A. 1 B. 2 C. 3 D. 4 E. 5
Which of the following isotopes has the longest half-life?
A. Phosphorus-32 B. Iodine-131 C. Iron-59 D. Cobalt-60
Which of the following is not seen in Addison's disease?
a. Marked Na+ loss in the urine b. Lowered blood glucose levels c. K+ retention d. Protein mobilization e. Poor response to stress
In ______________, carrier molecules move a substance against (up) the concentration gradient
A. facilitated diffusion B. simple diffusion C. endocytosis D. active transport E. exocytosis