It’s really living environments but I didn’t have that option but please help me I can’t fail

During exercise heart rate increases to accommodate for the increased need of oxygen through out body as well as to increase stroke volume (force and rate in which blood is expelled to the rest of the body). After exercising the rate in which your heart beats returns to a resting state (decreases) to reflect the decrease in the need for oxygen throughout your body.

Explanation:

it's the cell cycle, but cytokines is when the cell divides.

theres 3 stages interphase,mitosis,and cytokines.

interphase prepares the cell for division.

mitosis is the process of dividing the cell,it has 4 parts interphase,anaphase,metaphase,and telophase.

lastly there's cytokines,that's when the cell divides into 2 daughter cells