Answer:
B. The hamstrings must relax.
Explanation:
When the quadriceps contact, the hamstrings must relax at the same time.
Answer:
Whenever there's a decrease of blood flow to the kidney, ADH is secreted which trigger the kidneys to reabsorbed water from the urine.
Increase ADH secretion: low volume and highly concentrated urine
Decrease ADH secretion: high volume and poorly concentrated urine (diluted)
This is known as extinction
You're right, it is D.
A theory can be changed if evidence is found that contradicts the current theory.
B is the answer for this question
