BIO 11 Lecture Notes - Lecture 5: Vagal Tone, Carotid Sinus, Vasomotor Center
Document Summary
Movement of blood and factors affecting it. Skeletal and respiratory pumps help blood pump throughout the body factors that affect blood flow to different parts of the body. Exercise (normal temp): blood flow to skeletal muscles, brain, heart and lungs. Exercise (high temp): blood flow to skeletal muscles, brain, skin, lungs, heart. Rest: blow flow equally throughout the body. Vasoconstrictors: angiotensin ii, calcium ions (ca2+), endothelin, epinephrine, norepinephrine, thromboxane, adh (vasopressin) Vasodilators: adp, anp, bradykinin, co2 in tissue, h+ in tissue, histamine, If you increase peripheral resistance, it"s harder to push the blood to distant tissues. you"re preventing blood from moving excessively in peripheral tissue so that it can go to the main tissues (brain) Chemoreceptors: respond to chemicals in the blood and cf (high co2/h, low o2) Carotid and aortic bodies when stimulated cause chemoreceptor reflex: vasomotor center causes vasoconstriction in body, vasodilation in brain. Baroreceptors: respond to high blood pressure fluid shift, vagal tone, vasomotor tone.
