{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Biol 216 9 Circulatory System 160-177.pdf

Biol 216 9 Circulatory System 160-177.pdf - Acetylcholine...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
5/24/17 1 Acetylcholine is released by autonomic nerves in the walls of the blood vessel This dilates blood vessels, increases blood flow 5/24/17 160 5/24/17 161
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
5/24/17 2 Cardiac Output Controlled by regulating the rate and strength of the heartbeat Baroreceptors :a type of mechanoreceptor, located in walls of blood vessels, cardiac muscle, aorta, carotid arteries etc. Detect amount of stretch Send signals tothe medulla in the brain stem Brainstem centers send signals via the autonomic nervous system toadjust rate and force of heartbeat 5/24/17 162 5/24/17 163
Background image of page 2
5/24/17 3 Cardiac Output Also influenced by O2 content of the blood O2 content of blood is detected bychemoreceptorsin the aorta and carotid arteries Example: O2 falls below normal, signals sent to brainstem to increase rate and force of heart, increasing cardiac output 5/24/17 164 Vessel control Arterioles are under both local control and central (extrinsic) control. The local control is to meet the needs of a particular tissue. The centralcontrols are going to be more important in meeting the needs of the whole body, such as maintaining blood pressureor maintaining the body temperature.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}