Levels of which of the following are responsible for regulating respiratory activities under normal conditions?

A) oxygen
B) carbon dioxide
C) bicarbonate ion
D) sodium ion
E) hemoglobin


B) carbon dioxide

Anatomy & Physiology

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A cluster of neurons in the peripheral nervous system is called a ________

A) pod B) nucleus C) fasciculus D) ganglion

Anatomy & Physiology

The two lobes of the pituitary gland together produce or store how many hormones?

A) 3 B) 5 C) 7 D) 9 E) 16

Anatomy & Physiology

The respiratory quotient is ________ for consumed carbohydrates compared to proteins and fats.

A) the same B) highest C) lowest

Anatomy & Physiology

Venous return is affected by

a. the cardiac suction effect. b. the respiratory pump. c. the skeletal muscle pump. d. none of these. e. all of these.

Anatomy & Physiology