Questions: The diaphragm will contact when stimulated by: a. The Beta 2 property of Epinephrine. b. The Beta 1 property of Epinephrine. c. The Phrenic nerves. d. The Alpha 2 property of Epinephrine.

The answer is c: The Phrenic nerves.

Explanation for each option:

a. The Beta 2 property of Epinephrine: Beta 2 receptors are primarily involved in the relaxation of smooth muscles, such as those in the airways and blood vessels. They do not directly stimulate the diaphragm to contract.

b. The Beta 1 property of Epinephrine: Beta 1 receptors are primarily found in the heart and are responsible for increasing heart rate and contractility. They do not directly affect the diaphragm.

c. The Phrenic nerves: The phrenic nerves are responsible for stimulating the diaphragm to contract. They originate in the cervical spinal cord (C3-C5) and are the primary motor supply to the diaphragm, making this the correct answer.

d. The Alpha 2 property of Epinephrine: Alpha 2 receptors are involved in inhibiting the release of norepinephrine and other neurotransmitters, primarily affecting the central nervous system and vascular smooth muscle. They do not directly stimulate the diaphragm.

In summary, the diaphragm contracts when stimulated by the phrenic nerves.