Which of the following statements about the control of circulation in humans is incorrect?

• A. Sympathetic nerve input to skeletal muscle causes the blood vessels in the muscle to dilate.
• B. Blood flow can be regulated by autonomic nerve signals emanating from cardiovascular control centres in the medulla of the brain.
• C. Carotid artery chemosensors detect low \[{{O}_{2}}\] levels in the blood and promote, increased blood pressure.
• D. Hormones such as angiotensin and vasopressin cause venules to constrict.