Multiple Choice
Refer to the figure showing feedback information that controls breathing in humans. The nerves labeled 1 are _______; the structure labeled 2 senses the _______; and the nerve labeled 3 is _______.
A) sensory; O2 content of the blood; a sensory nerve that goes to the heart
B) sensory; hydrogen ions in the cerebrospinal fluid; a motor nerve that stimulates the diaphragm to contract
C) sensory; N2 content of the blood; a motor nerve that innervates the intercostal muscles
D) motor; O2 content of the blood; a sensory nerve to the diaphragm
E) motor; pH of the blood; the phrenic nerve
Correct Answer:

Verified
Correct Answer:
Verified
Q237: For air breathers, the partial pressure gradient
Q238: In which of these PO<sub>2</sub> environments would
Q239: If a mouse carries a mutation that
Q240: Breathing provides the body with the oxygen
Q241: Which event can occur when fetal and
Q243: External gills, tracheae, and lungs share which
Q244: How can an aquatic animal with no
Q245: The movement of O<sub>2</sub> and CO<sub>2</sub> between
Q246: Aquatic animals that lack an internal system
Q247: Which statement about the respiratory organs of