Where is dystrophin, the protein that is defective in muscular dystrophy, normally found?
A. Between the outermost myofilaments and the sarcolemma of a muscle fiber
B. As a transmembrane protein of the sarcolemma
C. In the Z discs of skeletal and cardiac muscle
D. In the dense bodies of smooth muscle
E. Bridging the gap between the sarcolemma and synaptic knob
A. Between the outermost myofilaments and the sarcolemma of a muscle fiber
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Which of the following are characteristics of BOTH erythrocytes and thromobocytes?
a) no nucleus b) large segmented nucleus c) cytoplasmic granules d) lifespan of 5 to 9 days e) develop from myeloblasts f) more than one answer selection is correct
Which property of water is demonstrated when we sweat?
A) high heat capacity B) high heat of vaporization C) polar solvent properties D) reactivity E) cushioning
Select the statements about blood pressure regulation that are true?
A. Parasympathetic activity at synapses with arteriolar smooth muscle is a primary means of regulating MAP B. During the gain in adipose (fat) tissue associated with obesity, the overall length of blood vessels in the systemic circuit increases; this would tend to decrease MAP C. Decreased vagal nerve activity at the SA node will tend to increase cardiac output and MAP D. Decreases in CO2 and increases in O2 around arterioles in active muscle will produce vasodilation E. Increases in CO2 and decreases in O2 around arterioles in active muscle will produce vasodilation F. Long-term regulation of MAP is primarily due to changes in blood volume G. Increased activity of the skeletal and respiratory pumps during exercise tends to increase stroke volume H. Most baroreceptors are located in the limbs in order to closely regulate blood pressure to the periphery I. Sympathetic neurons innervate the smooth muscle layer of many arterioles J. In response to a sudden decrease in MAP, parasympathetic activity will be decreased and sympathetic activity increased K. The sympathetic NS is an important regulator of minute-to-minute changes in blood flow to organs and MAP
Which of the following is not true of muscle tissues?
A. All muscle cells are striated. B. Muscle tissues are excitable. C. Muscle cells are specialized for contraction. D. Muscle cells have a difference in electrical charge across their plasma membrane. E. Muscle cells form the basis for the movement of body parts.