What is the function of apoptosis?
A. To remove old, worn out cells
B. To remove cells that have fulfilled their function are no longer needed
C. Programmed cell death
D. All of these are correct.
Answer: D
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Why are calcium ions necessary for skeletal muscle contraction?
A) Calcium ions increase the speed of the action potential transmitted along the sarcolemma. B) Calcium ions release the inhibition on Z discs. C) Calcium ions trigger the binding of myosin heads to actin filaments. D) Calcium ions cause ATP binding to actin. E) Calcium ions bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments.
What is the most common type of neuron?
A. Multipolar B. Bipolar C. Unipolar D. Anaxonic E. Dendritic
The ________ of the humerus establishes the lateral contour of the shoulder.
A) deltoid tuberosity B) greater tubercle C) lateral epicondyle D) capitulum E) trochlea
The flagellum is used to
A) penetrate the corona radiata. B) survive. C) move the sperm to the oocyte. D) penetrate the oocyte. E) become capacitated.