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3. A giraffe has MAP = 200 mmHg and a distance between its heart and its brain of 2 m. Assume that the Phydrostatic for a giraffe is the same as for a human. a. What is P. in a giraffe's brain when the animal's neck is held upright? (2 points) b. When a giraffe bends down to drink, its brain is now 2 m below its heart. Now what is P.? (2 points) c. Giraffes have evolved "tricky" veins that are unique in the animal kingdom to "deal" with the effect of gravity on such a long neck. i. When upright, the head and neck veins constrict to increase their resistance. What is the effect of this on Pv? On AP? On flow through the giraffe's brain? (3 points) ii. The head and neck veins also have numerous valves. When bending to drink, these valves serve to "break up" the column of blood above the brain. What is the effect of this on P,? On AP..? On flow through the giraffe's brain? (3 points)

3. A giraffe has MAP = 200 mmHg and a distance between its heart and its brain of 2 m. Assume that the Phydrostatic for a giraffe is the same as for a human. a. What is P. in a giraffe's brain when the animal's neck is held upright? (2 points) b. When a giraffe bends down to drink, its brain is now 2 m below its heart. Now what is P.? (2 points) c. Giraffes have evolved "tricky" veins that are unique in the animal kingdom to "deal" with the effect of gravity on such a long neck. i. When upright, the head and neck veins constrict to increase their resistance. What is the effect of this on Pv? On AP? On flow through the giraffe's brain? (3 points) ii. The head and neck veins also have numerous valves. When bending to drink, these valves serve to "break up" the column of blood above the brain. What is the effect of this on P,? On AP..? On flow through the giraffe's brain? (3 points)

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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3. A giraffe has MAP = 200 mmHg and a distance between its heart and its brain of 2 m. Assume that the Phydrostatic for a giraffe is the same as for a human. a. What is P. in a giraffe's brain when the animal's neck is held upright? (2 points) b. When a giraffe bends down to drink, its brain is now 2 m below its heart. Now what is P.? (2 points) c. Giraffes have evolved "tricky" veins that are unique in the animal kingdom to "deal" with the effect of gravity on such a long neck. i. When upright, the head and neck veins constrict to increase their resistance. What is the effect of this on Pv? On AP? On flow through the giraffe's brain? (3 points) ii. The head and neck veins also have numerous valves. When bending to drink, these valves serve to "break up" the column of blood above the brain. What is the effect of this on P,? On AP..? On flow through the giraffe's brain? (3 points)
Transcribed Image Text:3. A giraffe has MAP = 200 mmHg and a distance between its heart and its brain of 2 m. Assume that the Phydrostatic for a giraffe is the same as for a human. a. What is P. in a giraffe's brain when the animal's neck is held upright? (2 points) b. When a giraffe bends down to drink, its brain is now 2 m below its heart. Now what is P.? (2 points) c. Giraffes have evolved "tricky" veins that are unique in the animal kingdom to "deal" with the effect of gravity on such a long neck. i. When upright, the head and neck veins constrict to increase their resistance. What is the effect of this on Pv? On AP? On flow through the giraffe's brain? (3 points) ii. The head and neck veins also have numerous valves. When bending to drink, these valves serve to "break up" the column of blood above the brain. What is the effect of this on P,? On AP..? On flow through the giraffe's brain? (3 points)
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