Muscles that flex the elbow are innervated by (the)
A) axillary nerve.
B) ulnar nerve.
C) radial nerve.
D) musculocutaneous nerve.
E) both the radial and musculocutaneous nerves.
E) both the radial and musculocutaneous nerves.
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Which of the following statements regarding contraction in skeletal and smooth muscle is TRUE?
A. In skeletal muscle, calcium initiates contraction by binding to myosin light-chain kinase, while in smooth muscle calcium initiates contraction by binding directly to tropomyosin. B. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding to calmodulin. C. In skeletal muscle, calcium ions bind to a regulatory protein on thin filaments; in smooth muscle, calcium ions bind to a regulatory protein on thick filaments. D. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding directly to myosin. E. All of the choices are true.
The specific strip of skin that is innervated by a specific spinal nerve is called a
A) root. B) ramus. C) trunk. D) ganglion. E) dermatome.
. Changes in blood osmolarity that turn off the thirst center also increase the release of ADH from the pituitary gland
Indicate whether this statement is true or false.
The total pressure of a gas is 100 mmHg and the mixture is composed of 20% oxygen, 10% water vapor, 5% CO2, and 65% Nitrogen: What is the partial pressure of water vapor?
a. 40 mmHg b. 15 mmHg c. 35 mmHg d. 20 mmHg e. 10 mmHg