Which is a TRUE statement about excitation-contraction coupling?
A. In skeletal muscle cells, it requires the influx of extracellular calcium ion.
B. In smooth muscle cells, it must be preceded by an action potential in the cell membrane.
C. In all kinds of muscle it requires the entry of calcium from the extracellular fluid.
D. Calcium-induced calcium-release plays a role in cardiac muscle cells, as well as in some smooth muscle cells.
E. In skeletal muscle cells, excitation-contraction coupling begins when an action potential propagates along the sarcoplasmic reticulum membrane.
D
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Glands that secrete hormones into the interstitial fluid are ________ glands
A) endocrine B) interstitial C) exocrine D) merocrine E) holocrine
Answer the following statements true (T) or false (F)
1. Ion pumps are examples of active transport processes. 2. Pinocytosis is a process by which the cell membrane takes in solid particles. 3. Phagocytosis is a process by which the cell membrane takes in fluid and dissolved substances. 4. A cell put in an isotonic solution would crenate. 5. A cell put in a hypotonic solution would lyse.
Which of the following pairs are NOT related in any way?
a. night blindness and retinene b. dark adaptation and sunlight c. long (L) cones and the color yellow d. primates and trichromatic vision e. cones and high visual sensitivity
_____ is the main source of chemical energy that drives all cellular work and belongs to the class of organic molecules known as _______.
Fill in the blank(s) with the appropriate word(s).