ANATOMY
LIMB VASCULATURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hold 25% of the blood in the body
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greatest densitiy in skeletal muscle cells, specifically Type I
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Bloodflow controlled by precapillary sphinctors
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Walls contain only a single layer of endothelial cells
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Major area of gas exchange
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Detailed explanation-1: -Gas exchange in the lungs takes place in alveoli, which are tiny air sacs surrounded by networks of capillaries . The pulmonary artery carries deoxygenated blood from the heart to the lungs, where it travels through pulmonary capillaries, picking up oxygen and releasing carbon dioxide.
Detailed explanation-2: -For gas exchange systems to be efficient, they must have the 4 characteristics that maximise the rate of diffusion. The specialised respiratory surface must have a large surface area to volume ratio (SA : V). The specialised respiratory surface must be moist. The the specialised respiratory surface must be thin.
Detailed explanation-3: -They have a large surface area relative to the volume of the organism. They are thin and so have a short diffusion pathway. They have a moist surface where gases can dissolve first before they diffuse in or out. More items