Anim negative feedback control blood pressure worksheet PDF

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Negative Feedback Control of Blood Pressure Instructions: please answer the questions below.

1. Explain how high or low blood pressure affects capillary blood flow. When blood pressure is low it will result in a reduced blood flow into the capillaries, when the blood pressure is to high it can possible cause the capillaries to break releasing the blood leading to a stroke.

2. What is the function of baroreceptors? Baroreceptors measure changes in blood pressure it will than send out a signal so that the correct measure will be taken; if the blood pressure is high the artery walls will stretch. However, if the blood pressure is low the baroreceptors will make it so that the walls have less stretch.

3. Explain the negative feedback loop between baroreceptors, the cardiovascular (CV) center, and the heart. Address: dropping blood pressure, heart stimulation, and hormonal vessel constriction. How do these all work together to achieve homeostasis? When the heart rate gets too high and cardiac output is too much, the increased blood pressure stretches the baroreceptors in the aorta and carotid arteries. This causes the baroreceptors to fire more frequently. The signal traverses the glossopharyngeal and vagus nerves to the cardio regulatory and vasomotor centers in the medulla. Ultimately parasympathetic stimulation is triggered and heart rate decreases. Also, sympathetic stimulation is decreased, which further decreases the heart rate. Vasodilatation occurs due to decreased sympathetic stimulation. All of this brings the cardio system back to normal. When the heart rate and blood pressure get too low, the opposite happens. This is negative feedback; negative feedback is not activated until something goes wrong, the negative feedback loop is a compensatory mechanism to pull everything back into a state of homeostasis.

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