Answer:
we take longer to reproduce sadly.
Answer:
It is a definition of demand characteristics.
Explanation:
The term demand characteristics originated in Martin Orne's work as the test group understood what was the investigation and acted consequently. Thus, the way an experiment is built may lead participants to answer unconsciously to what they believe the researcher wants. When the participants form a notion of where the experiment is heading, they probably behave accordingly. One way to avoid the effects of demand characteristics on research is to use deception and guide participant to act more naturally as they cannot guess the purpose of the experiment.
Answer:
The heart valves
Explanation:
The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.
D) no change in cardiac output, increased heart rate, decreased stroke volume occurs after blood donation
Explanation:
When a person donates blood, there is a slight loss of blood volume or hypovolemia. This triggers the baroreceptors of the blood; although does not trigger the osmoreceptor.
The baroreceptor responses are according to the arterial pressure which rises momentarily and results in increased sympathetic activity with decreased vagal activity.
These changes will lead to vasoconstriction, reduced stroke volume, increased heart rate or tachycardia which helps to maintain the cardiac output.
The soreness at the venepuncture site on the skin is due to bruising which is common after any needleprick. applying cold pack, elevating and resting the arm.
In order to compensate for the fluid volume loss and avoid dehydration, one must take plenty of fluids before and after blood donation.
