From ages 20 to 70, we see a loss of lean body mass as a result of up to 30 percent loss in the number of muscle cells, atrophy of muscle cells, and a general decrease in muscle strength
Indicate whether the statement is true or false.
TRUE
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Which of the labeled structures in the diagram of the trigeminothalamic pathway is a second-order neuron?
a) A b) B c) C d) D e) E
Structurally, the plasma membrane
A) contains no imbedded proteins. B) separates the chromatin from the cytoplasm in eukaryotes. C) contains carbohydrate molecules only. D) is nonporous. E) is composed of a bilayer of lipids.
In your own words restate and explain Cannon's four postulates for maintaining homeostasis.
What will be an ideal response?
Arrange the following list of biochemical events in the correct sequence
(1) An action potential is conducted deep into the muscle fiber by the T tubule. (2) Calcium ions bind to troponin. (3) The membranes of the sarcoplasmic reticulum become more permeable to calcium ions. (4) Calcium ions diffuse into the sarcoplasm around the myofibril. (5) The troponin-tropomyosin complex moves exposing active sites. A. 1, 5, 2, 3, 4 B. 1, 3, 4, 2, 5 C. 1, 2, 3, 4, 5 D. 1, 3, 2, 5, 4 E. 1, 4, 3, 2, 5