The structure of a testis can be described as composed of
A. about 250 lobules, each of which contains 1 to 4 seminiferous tubules.
B. a single very long seminiferous tubule that winds through the structure.
C. semen in various stages of development held in seminiferous tubules.
D. 1 to 4 lobules, each of which contains about 250 seminiferous tubules.
Answer: A
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Answer the following statements true (T) or false (F)
1. In an asthma attack, medication is inhaled to relax the constricted muscles of the bronchioles. 2. The smallest and last part of the air distribution system of the respiratory tract is the alveolar ducts. 3. Surfactant is needed in the lung to increase the surface tension in the alveoli. 4. Premature infants may not make sufficient surfactant in the lung. This may increase the probability that the alveoli in the lungs will collapse. 5.
Hypoventilation is a cause of:
a. respiratory acidosis b. respiratory alkalosis c. metabolic acidosis d. metabolic alkalosis e. pulmonary edema
What is the primary method by which materials such as O2, CO2 and nutrients are exchanged between the blood and surrounding tissues?
a. passive diffusion of substances across the capillary wall down their concentration gradients. b. active transport of materials across the capillary wall. c. osmotic pressure drawing water and solutes out of the capillary, bringing these dissolved nutrients into contact with the tissue cells. d. processes of ultrafiltration and reabsorption. e. bulk flow.
Loss of voluntary control over urination is called _____.?
A) ?neurogenic bladder B) ?dialysis C) ?incontinence D) ?uremia