Answer:
D The heart will pump less blood per beat because the blood vessels will have less blood to circulate is the most likely scenario that would occur in a zero gravity chamber.
When in a zero gravity environment, the body experiences a redistribution of fluids, causing the blood to pool in the upper body and head. This shift in fluid balance can lead to a decrease in the amount of blood returning to the heart, resulting in the heart pumping less blood per beat.
This change in cardiovascular function can cause a range of physiological responses, including a decrease in blood pressure and cardiac output, as well as an increase in heart rate. However, feeling energetic or dizzy are not likely to be the primary responses to zero gravity, as they are not directly related to changes in cardiovascular function.
Step-by-step explanation:
When we are in a gravitational field, such as on Earth, our body experiences a constant force that pulls fluids (including blood) towards our lower body. However, in a zero gravity environment, this force is no longer present, which causes the fluids to shift towards the upper body and head due to the lack of gravity. This can lead to a decrease in the amount of blood returning to the heart, causing the heart to pump less blood per beat.
As a result of this shift in fluid balance, the body may experience changes in cardiovascular function. For example, the decrease in the amount of blood returning to the heart can cause a decrease in cardiac output, which is the amount of blood pumped by the heart per minute. This decrease in cardiac output can cause a decrease in blood pressure, which is the force exerted by blood against the walls of blood vessels.
However, in response to the decrease in cardiac output and blood pressure, the body may try to compensate by increasing the heart rate. The heart rate is the number of times the heart beats per minute, and it can increase in order to maintain blood flow to the body's tissues and organs.
In summary, in a zero gravity chamber, the most likely scenario is that the heart will pump less blood per beat because of the shift in fluid balance. While changes in heart rate and blood pressure may also occur, feeling energetic or dizzy are not necessarily direct physiological responses to these changes.