Which bones articulate with the humerus?
A. Clavicle, scapula, ulna, and radius
B. Scapula and radius
C. Scapula, radius, and ulna
D. Clavicle and ulna
E. Scapula and ulna
Answer: C
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A) amino acids of hemoglobin. B) iron ions found in hemoglobin molecules. C) globin chains of hemoglobin. D) heme molecules of hemoglobin that lack iron.
What is the power stroke?
A. The movement of myosin head while attached to actin myofilament B. A T tubule and two adjacent terminal cisternae C. The combination of myosin heads with active sites on actin molecules D. A protein found along the groove of the F-actin double helix E. After exercise, the O2 taken in that exceeds the O2 required for resting metabolism
What ion is necessary for the release of neurotransmitter from synaptic vesicles?
A. chloride B. sodium C. potassium D. calcium
An antibacterial enzyme that is present in saliva, tears, and sweat is
A. lysozyme. B. antibodies. C. antigen. D. interferon.