What may happen if the ductus arteriosus fails to close shortly after birth?
A. Blood may flow from the right atrium to the left atrium.
B. The coronary arteries may have abnormally increased blood flow.
C. The walls of the heart may become thin and flaccid.
D. Blood may flow from the aortic arch to the lungs.
E. Valvular stenosis may interrupt blood flow.
D. Blood may flow from the aortic arch to the lungs.
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Fibroblasts and protein fibers are associated with both ________ and ________.
A. spongy bone; compact (dense) bone B. elastic cartilage; hyaline cartilage C. plasma; formed elements D. adipose tissue; reticular tissue E. dense regular; dense irregular connective tissues
Glycogen is the
A. storage carbohydrate in animals. B. storage carbohydrate in plants. C. sugar found in RNA. D. major nutrient for most body cells. E. nondigestible plant polysaccharide.
Which would be true if substance X was moving into a cell by primary active transport?
A. A cell is placed into a 1 millimolar solution of substance X and over time you witness the size of the cell swell. B. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 1 millimolar. C. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell decrease to 0.5 millimolar. D. A cell is placed into a 1 millimolar solution of substance X and over time you witness the size of the cell shrink. E. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar.
Which of the following is not true of oxytocin?
A) It is one of the few hormones that is regulated by a positive feedback loop. B) It is produced in the thyroid gland. C) It stimulates "milk letdown" in nursing mothers. D) It causes the contractions of the uterus during labor.