When you exercise, which of the following can provide you with a feeling of peace and happiness?
the answer is b. Endorphin
any of a group of hormones secreted within the brain and nervous system and having a number of physiological functions. They are peptides that activate the body's opiate receptors, causing an analgesic effect.
I think you did some activity where you kept track of your heart rate and based on your knowledge of the circulatory and respiratory system you need to explain how your heart rate changed and why your heart rate changed.
A fertilized egg, or zygote, takes about five days to reach the uterus from the uterine tube. As it moves, the zygote divides and develops into a blastocyst, with an inner mass of cells and a protective outer ring. The blastocyst attaches to the wall of the uterus and gradually implants itself into the uterine lining.
It causes symptoms like thirst, headache, weakness, dizziness and fatigue.
Negative-feedback: Heart rate goes down
Positive-feedback: Hear rate goes up
