Biol 216 9 Circulatory System 160-177.pdf

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

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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
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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
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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.
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