Lucy, a new Army recruit, stood in formation for long periods of time without moving an inch. She eventually became lightheaded and fainted because her blood pressure dropped. What might have caused her blood pressure to drop?
What will be an ideal response?
Venous return depends largely on muscle contraction to move blood through the veins. If a person stands upright for long periods of time without moving much, the muscles don't contract much; thus, as a result of poor venous return, the person may experience a drop in blood pressure.
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The primary pacemaker of the heart is the
(a) bicuspid valve. (b) tricuspid valve. (c) aorta. (d) sinoatrial node.
The thick folds on the surface of the cerebrum are called______________ and the grooves that lie between them are called ______
Fill in the blank(s) with the appropriate word(s)
Studies of glucose transport in liposomes have revealed that:a
glucose is transported against a concentration gradient. b. the binding of glucose triggers a conformational change in the carrier protein. c. the transport of solutes via carrier proteins is faster than via channel proteins. d. glucose phosphates move readily across the membrane by simple diffusion. e. glucose moves readily across the membrane by simple diffusion
The house fly, Musca domestica, has a haploid chromosome number of 6. How many chromatids should be present in a diploid, somatic, metaphase cell?
What will be an ideal response?