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Regulating BP/Flow
Peripheral Mechanisms - Chemical Control
Question | Answer |
---|---|
What are the 4 methods of Chemical Control which regulate BP/Flow? | 1. Co2; 2. Epinephrine; 3. Histamine; 4. pH |
How does CO2 exert chemical control over BP/Flow? | 1. direct DILATING action on most Arterioles; 2. helps maintain normal activity of CVC |
What effect does Epinphrine have on ß1-adrenergic Receptors? | DEPOLARIZES --> increased HR |
What effect does Epinphrine have on ß2-adrenergic Receptors? | HYPERPOLARIZES Skeletal and Coronary Arterioles --> decreased PR --> decreased BF |
What effect does Epinphrine have on alpha-adrenergic Receptors? | DEPOLARIZES Cutaneous, Renal, and GI Arterioles --> increased PR --> decreased BF |
Hoe does Histamine enter the Circulatory System? | released from Tissues under Trauma or Allergic reaction |
What effect does Histamine have on BP/Flow? | GENERALIZED Vasodilation and INCREASED Capillary premeability |
What effect does Histamine have on the Inspiratory Center? | Bronchiole CONSTRICTION |
How does Histamin effect BP/Flow? | DECREASE Venous return --> decrease BP --> pass out |
How does pH effect BP/Flow? | decrease O2 --> increase acidity --> contribute to dilation |