Asked by Lianet Roman on Jul 12, 2024
Verified
In a physiology lab, the students designed an experiment to illustrate how the heart responds to changes in blood pressure. Everyone relaxed and then did a headstand. Which of the following observations are consistent with the change in the function of their hearts?
A) Increased heart rate
B) Decreased heart rate
C) Increased stroke volume
D) Decreased stroke volume
E) Both decreased heart rate and increased stroke volume
Stroke Volume
The volume of blood pumped by the heart's left ventricle in one contraction.
Blood Pressure
The pressure of circulating blood on the walls of blood vessels, typically measured on the arteries, essential for circulating oxygen and nutrients.
- Analyze the body's physiological responses to changes in posture, blood chemistry, and oxygen levels.
Verified Answer
AM
Annabelle MidcalfJul 17, 2024
Final Answer :
E
Explanation :
When the body is inverted, as in a headstand, blood pressure increases in the upper body, including the heart and carotid arteries. The baroreceptors in these areas detect the increased pressure and signal the brain to lower the heart rate to reduce blood pressure, leading to a decreased heart rate. Additionally, the increased venous return to the heart during the headstand can lead to an increased stroke volume, as the heart pumps more blood per beat to manage the influx.
Learning Objectives
- Analyze the body's physiological responses to changes in posture, blood chemistry, and oxygen levels.
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