Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
a) sarcolemma, axon of neuron, T tubules
b) T tubules, sarcolemma, myofilament
c) muscle fiber, axon of neuron, myofibrils
d) axon of neuron, sarcolemma, T tubules
e) myofibrils, myofilaments, mitochondria
d
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The iliopsoas, sartorius, and rectus femoris muscles adduct the thigh.
Answer the following statement true (T) or false (F)
Which of the primary tissue types is most widely distributed throughout the body?
A. Muscle B. Epithelium C. Nervous D. Connective
Which of the following is not secreted by the pancreas?
A. Somatotropin (growth hormone) B. Insulin C. Somatostatin (growth hormone-inhibiting hormone) D. Glucagon E. Gastrin
Simple goiter
A. is an enlargement of the thymus gland. B. is due to lack of iodine in the diet. C. is due to high levels of thyroxine in the blood. D. is described by all of these characteristics.