Q: What structures of the cardiovascular system help regulate body processes by either constricting or dilating?


Read this paragraph and choose the correct option from the provided answers:

Blood vessels help regulate body processes by either constricting (becoming narrower) or dilating (becoming wider). These actions occur in response to signals from the autonomic nervous system or the endocrine system. Constriction occurs when the muscular walls of blood vessels contract. This reduces the amount of blood that can flow through the vessels (see Figure below ). Dilation occurs when the walls relax. This increases blood flows through the vessels.

 Choices:

- muscles

- cartilage

- capillaries

- blood vessels


A:
blood vessels