Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute
A) 20-40
B) 40-60
C) 80-100
D) 100-140
E) 140-180
C
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Which of the following substances is most alkaline?
A) stomach secretions, pH = 1 B) white wine, pH = 3 C) urine, pH = 6 D) tomato juice, pH = 4 E) lemon juice, pH = 2
Which of the following is NOT a function of hydrochloric acid in the stomach?
a. activating pepsin b. killing microorganisms c. facilitating protein digestion d. breaking down disaccharides into monosaccharides
Which of the following statements regarding homeostasis is false?
A. If the body detects a change and works to make the levels move even farther away from homeostasis, that is positive feedback. B. Homeostasis is the body's ability to overcome an imbalanced internal environment. This is achieved using positive and negative feedback mechanisms. C. Homeostasis is the body's ability to maintain a steady internal environment. This is achieved using positive and negative feedback mechanisms. D. If the body detects a change beyond its normal homeostasis range (either too high or too low) and it works to reach its homeostasis range by reversing the direction of movement, that is positive feedback.
The minimum stimulus needed to cause muscle contraction is called the ________.
A. innervation B. motor unit C. threshold D. latent period E. twitch