Which buffer system accounts for 75% of all chemical buffering in the body fluids?
A) The bicarbonate system
B) The ammonium buffer system
C) The carbonic acid system
D) The protein buffer system
E) The phosphate system
D
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The internal intercostal muscles are inspiratory muscles because they lift the ribs upward and outward to enlarge the thoracic cavity
Indicate whether the statement is true or false
Which hormone is produced first by the corpus luteum and then by the placenta?
A. Estrogen B. Progesterone C. Human chorionic somatomammotropin D. Human chorionic gonadotropin
Examples of physical barriers against pathogens include all of the following except
A) sebaceous glands. B) mucus. C) epithelia. D) epidermal layers. E) blood.
The absolute refractory period ends when
A. inactivation gates of voltage-gated Na+ ion channels reopen. B. activation gates of voltage-gates Na+ ion channels reopen. C. the sodium-potassium exchange pump stops. D. voltage-gated K+ channels open. E. None of these choices is correct.