T tubules are invaginations of the
A. sarcoplasmic reticulum.
B. sarcomere.
C. myofibril.
D. sarcoplasm.
E. sarcolemma.
E
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Which of the following describes muscular tissue emerging directly from bone rather than being separated from it by an obvious tendon?
A. Aponeurosis B. Inverted attachment C. Direct attachment D. Indirect attachment
What causes RDS (respiratory distress syndrome) in premature babies?
A. Bronchioles are constricted due to excess production of mucus. B. There is insufficient production of surfactant. C. Muscles associated with respiration are not strong enough to expand the thorax. D. The lungs have not yet produced adequate numbers of alveoli for efficient gas exchange. E. Respiratory centers of the brain are not functional until late in the fetal stage.
Select the correct statement regarding skin functions.
A. When body temperature is higher than normal, blood flow to the skin is increased. B. Aging is usually associated with increased melanin production. C. The primary function of perspiration is to remove waste materials from the blood. D. A decrease in blood flow to the skin is associated with a feeling of warmth.
The most abundant negative ion in blood plasma is:
a. bicarbonate b. chloride c. hydroxide d. phosphate