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

Anatomy & Physiology

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Examples of physical barriers against pathogens include all of the following except

A) sebaceous glands. B) mucus. C) epithelia. D) epidermal layers. E) blood.

Anatomy & Physiology

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.

Anatomy & Physiology

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

Anatomy & Physiology

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

Anatomy & Physiology