Which of the following is NOT true of human MHC proteins?
A. They are called HLA (human leukocyte antigens).
B. They are linked to foreign antigens to activate a B cell.
C. They are found on all of one's body cells.
D. They are self-antigens.
Answer: B
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The term dorsal means
A. the back of the body or body part. B. closer to the point of attachment. C. the front of the body or body part. D. lying on the back, face upward. E. toward the head.
The blood suplly of the nail bed is called the __________
Fill in the blank(s) with correct word
Which of the following choices lists a correct sequence of events following the depolarization of transverse tubules in excitation-contraction coupling in cardiac muscle?
A. Calcium ion influx through sarcolemma, calcium release into cytosol, actin and myosin attach, thin myofilaments slide toward the middle of sarcomeres B. Calcium release into cytosol, actin and myosin attach, calcium ion influx through sarcolemma, thin myofilaments slide toward the middle of sarcomeres C. Calcium release into cytosol, calcium ion influx through sarcolemma, actin and myosin attach, thin filaments slide toward the middle of sarcomeres D. Calcium release into cytosol, actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium ion influx through sarcolemma E. Actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium release into cytosol
Which of these is a function of the skeletal system?
a. creation of the structural framework within soft organs of the body b. communication system c. removal of old or damaged blood cells d. storage site for calcium