Why is the contraction strength of smooth muscle relatively independent of its resting length?
A) It is regulated by a length-tension relationship.
B) It does not have intercalated discs.
C) It does not have sarcomeres.
D) It gets nearly all of its Ca2+ from the extracellular fluid.
E) It is involuntary muscle.
C
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Norepinephrine has the following effect on pacemaker cells:
A) Increased sodium influx. B) Increased potassium influx. C) Increased ATPase activity. D) Decreased calcium influx.
What neurotransmitter is made from tryptophan?
a. acetylcholine b. serotonin c. dopamine d. glutamate e. norepinephrine
The activation of additional motor units in a skeletal muscle, in order to increase muscle tension, is called motor unit recruitment.
Answer the following statement true (T) or false (F)
The proximal convoluted tubules and the distal convoluted tubules are surrounded by the ________.
A. peritubular capillaries B. segmental arteries C. vasa recta D. efferent glomerular arterioles