Nervous and Hormonal Control of Vasculature

Question 1

Give 5 examples of paracrine/autoregulation agents that influence vascular control.

Answer 1

Nitric oxide, prostaglandins, endothelin, K+, H+.

Question 2

From what region of the spinal cord do sympathetic preganglionic fibres arise?

Answer 2

Intermediolateral region (IML) of the thoracolumbar spinal cord.

Question 3

The RVLM receives info from what parts of the brain?

Answer 3

Hypothalamus, CVLM.

Question 4

Explain the role of RVLM-sympathetic pathways that innervate the gut and skin during exercise.

Answer 4

Gut - increased sympathetic nerve stimulation, causing vasoconstriction and therefore reduced blood flow.

Skin - reduced sympathetic nerve stimulation, causing vasodilation and therefore increased blood flow. This increases heat loss by radiation.

Question 5

Name the 3 types of vasodilator nerves.

Answer 5

Parasympathetic, sympathetic, nociceptive C fibres.