The rate of cell division is controlled by soluble factors found in the cell membrane that surrounds the cells
Indicate whether the statement is true or false
False
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Presynaptic facilitation results from
a. alteration of calcium permeability b. continued generation of EPSPs c. neuromodulator effects d. increased neurotransmitter production e. none of the above
Which of the following normally occurs when a doctor's reflex hammer taps a patient's patellar tendon?
A. Alpha motor neurons stimulate contraction of intrafusal fibers in extensor muscles. B. Alpha motor neurons stimulate contraction of extrafusal fibers in extensor muscles. C. Alpha motor neurons that innervate ipsilateral flexor muscles are stimulated. D. Inhibitory interneurons reduce action potential firing in alpha motor neurons to extrafusal fibers of extensor muscles. E. Golgi tendon organs in the patellar tendon stimulate the contraction of extrafusal fibers of extensor muscles.
During the process of endochondral ossification, chondrocytes in the cartilage model die. Why does this occur?
A. Blood supply to the cartilage is cut off by the developing periosteum. B. Canaliculi connecting adjacent chondrocyte lacunae fuse. C. Phagocytic osteoclasts in the new bone engulf and destroy the chondrocytes. D. The developing bone collar secretes enzymes that destroy the chondrocytes. E. Nutrients cannot diffuse to the chondrocytes through the calcified matrix.
The volume of the antrum is largest in a ________ follicle.
A. secondary B. polar C. primordial D. mature E. primary