Questions: Hemorrhage with a large loss of blood causes no change in blood pressure but a change in respiration a rise in blood pressure due to change in cardiac output a lowering of blood pressure due to change in cardiac output no change in blood pressure but a slower heart rate

The answer is the third one: a lowering of blood pressure due to change in cardiac output.

Explanation for each option:

1. No change in blood pressure but a change in respiration: This is incorrect because a large loss of blood typically leads to a decrease in blood pressure due to the reduced volume of blood circulating in the body.
2. A rise in blood pressure due to change in cardiac output: This is incorrect because a large loss of blood generally results in a decrease in cardiac output, which would lower blood pressure, not raise it.
3. A lowering of blood pressure due to change in cardiac output: This is correct because a significant hemorrhage reduces the volume of blood available for the heart to pump, leading to a decrease in cardiac output and consequently a drop in blood pressure.
4. No change in blood pressure but a slower heart rate: This is incorrect because a large loss of blood would typically cause a decrease in blood pressure and often an increase in heart rate as the body attempts to compensate for the loss of blood volume.

Summary: A large loss of blood due to hemorrhage causes a lowering of blood pressure due to a change in cardiac output.