Answer:
a greater volume of blood returning to the heart
Explanation:
Your heart rate goes up when your heart starts pumping faster.
When the race is almost to begin, nervous system sends signals to the heart causing the respiratory rate to increase. since there is an increase in heart rate, breathing and sweating becomes increases in order to maintain a normal body temperature.
Answer:
The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Explanation:
Answer:
B.Allergies .many people are there who are allergic to things.
