Sequence the following events involved in muscle cell contraction:
1 . Sodium channels open and sodium flows in.
2 . Impulse reaches the axon's terminal.
3 . ACh binds to receptors on the muscle cell membrane.
4 . Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis.
5 . If enough sodium moves in to the muscle cell, an impulse (action potential) develops.
a. 1, 2, 3, 4, 5
b. 2, 1, 3, 4, 5
c. 2, 4, 3, 1, 5
d. 3, 4, 5, 1, 2
e. 3, 5, 2, 1, 4
C
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During an annual physical, your nurse collected urine and blood samples to ensure that your protein levels were normal. When the results came back, the nurse informed you that there was an excessive amount of protein in your urine. Which of the following would most likely be true?
A. Proteins crossed over into the glomerular capsule. B. Blood cells were pushed from the capillaries. C. Proteins were trapped in the inner layer of the nephron. D. The glomerular filtrate is extremely dilute.
The nucleus is surrounded by a double-layered membrane, the ____________________ which is pierced by many nuclear ____________________
Fill in the blank(s) with correct word
Bowing the head is an example of
A. rotation. B. pronation. C. flexion. D. lateral excursion. E. hyperextension.
What explains the dramatic acceleration in lengthwise bone growth at puberty?
A. Increased rate of calcium deposition occurs due to high blood calcium levels. B. Increased physical activity causes lengthwise growth in response to bone stress. C. Increased secretion of sex hormones promotes epiphyseal plate growth. D. Increased activity of osteoclasts occurs in response to parathyroid hormone stimulation. E. Increased absorption of dietary vitamins and minerals strengthens the matrix.