Said to have more organisms .
Answer: 1. Fur on mammals. 2. Claws on feline creatures.
"The heart rate increases during the exercise because the "adrenaline rush" signals for the heart to beat faster and to increase the oxygen delivery to muscles."
The heart normally beats more quickly during physical activity so that more blood can reach the body. By pumping more vigorously or by increasing the volume of blood that fills the left ventricle before it pumps, the heart increases the stroke volume. The amount of oxygen the muscles need to make energy increases during exercise. The heart needs to pump more oxygen-rich blood through the arteries during the exercise to meet the energy requirement.
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