8. The major function of the respiratory system is a exchange of axygen and carb

Question

8. The major function of the respiratory system is a exchange of axygen and carbon dioxide between the internal and external environments b. protection from the external environment c, maintenance of the balance of water d solutes in the internal environment d. coordination of body function through the synthesis and release of regulatery molecules e transport of materials between all cells of the body 9. Which of the following tissue types has more ground substance than fibers or cells, includes fibroblasts as the primary cell type, and is found in the skin and around organs? a bone b. loose connective tissue e adipose tissue d. blood e cartilage 10. o Which body fluid compartment contains high levels of Na and low levels of K+ and proteins? plasma only b. interstitial fluid only e. intracellular fluid only d. both plasma and intracellular fluid but not interstitial fluid e both plasma and interstitial fluid but not intracellular fluid 11. A lab technician places human red blood cells in a hypertonic solution. What will happen to the cells? Water will move out of the cells, and the cells will shrivel up. b. a. Water will move out of the cells and back into the cells at the same rate, and the cell volume will not change c Water will move into the cells, and the cells will swell d. Water will not move in either direction, and the cell velume will not change 12. Endocytosis a often occurs at specialized regions of the plasma membrane called clathrin-coated pits b. is the major mechanism through which peptide hermones transmit signals out of a target cell. c. involves outward extensions of the plasma membrane that surround a large particle or cell and then fuse to for m a vacuole containing the particle. d. is usually a very nonspecific process. e. only occurs in capillary endothelial cells 13. Competition for a membrane protein occurs when a a group of carrier proteins is operating at its maximum rate b. a preference of a carrier protein for a substance is demonstrated based on the differing affinities of the carrier for the substrates a carrier molecule has the ability to transport only one molecule or a group of closely related molecules c. d. molecules are moved by the use of vesicles instead of via transport proteins 14. Oxytocin is released by the posterior pituitary in response to cervical dilation. It in turn causes more uterine contractions that will further dilate the cervix. Which type of feedback loop does this represent? a. negative feedback b. positive feedback c. local control d autocrine feedback

Explanation / Answer

8) The major function of respiratory system is

a. exchange of oxygen and carbon dioxide between internal and external enviornment

9) Tissue that hass more ground substance than fibers and cells, includes fibroblast as the primary cell type and is found in skin and around organs

b. Loose connective tissue

10) Body fluid compartment that contain high level of sodium ion and low level of potassium ion and protein

a. plasma only

11) When RBC is placed in hypertonic solution then

a. Water will move out of the cell and the cell will shrink. (because water moves from high solute concentration region to low solute concentration region)

12) Endocytosis

d. Is very nonspecific process

13) Competition for membrane protein occurs when

b. A preference of carrier protein for a substance is demonstrated based on differing affinities of carrier for the substrates.

14) oxytocin

b. Positive feedback

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