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- When correcting myopia, should the cornea's curvature be adjusted larger or smaller to get a desired result? Explain.The arterioles (small arteries) leading to an organ, constrict in order to decrease flow to the organ. To shut down an organ, blood flow is reduced naturally to 2.10% of its original value. By what factor did the radii of the arterioles constrict? Penguins do this when they stand on ice to reduce the blood flow to their feet.You can apply a much larger bite force with your molars, in the back of your mouth, than with your incisors, at the front of your mouth. Explain why this is so.
- Only with great difficulty can you crush an egg when squeezing it along its long axis, but it breaks easily if you squeeze it sideways. Why?The primary organs of the respiratory system are the _____, which carry out this ecchange of gases as you breathe. Inhaling moves the diaphragm______and expands the _______.When you _______ the diaphragm relaxes. The diaphragm and ribs return to their original place.15. A mathematical model for blood flow in a large blood vessel predicts that the optimal values of the angles O and 2, which represent the (positive) angles of the smaller daughter branches (vessels) with respect to the axis of the parent branch are given by Aỗ + A¡ – A} 2 A, Aj A – A¡ + A} cose and cos0, 2 A,A2 where A, is the cross-sectional area of the parent branch and A, and A, are the cross-sectional areas of the daughter branches. See FIGURE 4.6.3. Let = 0, + 02 be the junction angle, as shown in the figure. Blood flow FIGURE 4.6.3 Branching of a large blood vessel in Problem 74
- If you are infusing a 1 L Iv bag of a normal saline at a rate of 100 ml per hour, how long will it take for the entire IV bag to infuse into the patient ?Suppose blood is pumped from the heart at a rate of 5.4 L/min into the aorta of radius 1.2 cm. Suppose blood is pumped from the heart at a rate of 5.4 L/min into the aorta of radius 1.2 cm. v= cm/s(a) As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 9.5 cm2, what is the total cross-sectional area of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is20.0 μm?
- The flow rate of blood in the aorta is 80 cm^3/s, beyond the aorta, this blood travels throughabout 6 x 10^9 capillaries. If the radii of these capillaries is 8 x 10^-4 cm, what is the speed ofthe flow of blood through the capillaries?(a) As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross- sectional area of the venules is 10.0 cm2 , what is the total cross-sectional area of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is 10.0 µm ?You are help to educate a patient on the ramifications of a partial arterial blockage you have recently discovered. To communicate the severity, you decide to tell the patient about how much of the volume of blood that normally passes through the artery has decreased. The relationship you are describing is called AV Poiseuille's equation and it reads: ™R^ (P₁-P₂) 8nl If the At radius of the artery decreases by a factor of 2 because of the blockage (as shown in the image below), by what factor has the volume flow rate (A) decreased? At Wall of artery (a) Artery wall thickening Blockage O Note: Do not explicitly include units in your answer, however (include number only). Including units (like cm) will result in the question being scored wrong.
