An athlete asks herself, "How hard should I train today?" Which concept are they MOST likely representing in their answer?

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive

We need to talk i am going through a lot