Which is the neurotransmitter that causes the release of calcium ions from reservoirs within the muscle cell and thereby initiates the steps of contraction?
A. Acetylcholinesterase
B. Acetylcholine
C. Serotonin
D. Norepinephrine
B
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Which cell in the figure contains a diploid nucleus?
a) A b) C c) D d) E e) F
The passage of water soluble substances through the plasma membrane is made possible by ____ in the membrane Cholesterol Glycolipids Phospholipids Proteins
Fill in the blank(s) with the appropriate word(s).
The density of receptors in a receptive field is usually greatest in the periphery of the field
Indicate whether the statement is true or false.
Vitamin C is essential for normal collagen synthesis. If a child suffered from a vitamin C deficiency, which layer of the skin would be most affected?
A. epidermis B. stratum basale C. stratum corneum D. stratum granulosum E. reticular layer of dermis