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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What neurotransmitter is made from tryptophan?
a. acetylcholine b. serotonin c. dopamine d. glutamate e. norepinephrine
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
Norepinephrine has the following effect on pacemaker cells:
A) Increased sodium influx. B) Increased potassium influx. C) Increased ATPase activity. D) Decreased calcium influx.
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)