Using the following data: Please answer the questions below: 1. When skeletal mu
ID: 71462 • Letter: U
Question
Using the following data: Please answer the questions below:
1. When skeletal muscle becomes active, blood flow to the muscle increases in proportion to metabolic activity (exercise hyperemia). Describe the mechanisms of exercise hyperemia (hint: look in your text). What factors regulate the blood flow locally in skeletal muscle during exercise?
2. As you walked uphill, your breathing may have become deeper (hyperpnea). Do you think that blood oxygen and carbon dioxide levels changed? Check your answer in the text or some other source on physiology. Now explain your answer. This is an example of which phenomenon in physiology?
3. At each elevation you have two measurements: heart rate and respiratory rate. Draw a scatterplot showing the relationship between the two variables. Use graph paper, and make the scatterplot by hand. Describe the form and shape of the scatterplot. Summarize in one sentence what the plot tells you about the relationship between heart rate and respiratory rate.
Location Description Time Distance from start (km) elevation (m) Heart Rate (beats/15 seconds) Respriation Rate (breaths/15 seconds) 1 Parking Lot 4 10:15 0 201 85 20 2 Top of First Hill 10:40 1.32 284 150 28 3 Bottom of Second Hill 10:55 1.61 239 128 24 4 Top of Second Hill 11:12 2.76 385 180 30 4a Top of Second Hill 11:12 2.76 385 180 30 after 5 minute rest 11:17 2.76 385 150 28 5 Discovery Monument 11:28 3.75 372 140 25Explanation / Answer
1.
Hyperemia is a condition in which the blood flow increases to different tissues in the body. It occurs mostly when the tissue is active. In active state the cells use more oxygen and glucose or fatty acids.
Skeletal muscle is a voluntary muscle, which is attached to bones by bundle of collagen fibers that are known as tendons.
During exercise, to supply the increased needs of oxygen the blood flow to the skeletal muscles increases. The increased pressure increases blood flow to the tissues. In contrast, increased resistance decreases the blood flow. During exercise, the blood flow through skeletal muscles is 15 to 20 times greater than resting muscles. The blood flow is regulated by local, nervous, and hormonal regulatory systems.
Epinephrine causes vasoconstriction in blood vessels of skin and vasodilation of blood vessels in skeletal muscles.
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