Question

Which of the following INCREASE during a bout of exercise?

1) Oxygen dissociation from hemoglobin
2) Tidal volume
3) End systolic volume
4) Vasodilation of the coronary arteries
5) Total peripheral resistance
6) Diastolic pressure

Answer 1

During exercise, oxygen dissociation from hemoglobin, tidal volume, and vasodilation of the coronary arteries increase to meet the body's demands, while end systolic volume, total peripheral resistance, and diastolic pressure usually decrease.

Step-by-step explanation:

During a bout of exercise, several physiological changes occur to meet the increased demands for oxygen and nutrients in the body's tissues. The factors that increase during exercise are:

1. Oxygen dissociation from hemoglobin - This increases because the increased levels of carbon dioxide and the decreased pH of the blood during intense exercise promote the release of oxygen from hemoglobin to the tissues.
2. Tidal volume - This refers to the amount of air that is inhaled and exhaled with each breath. Tidal volume increases to enhance the exchange of oxygen and carbon dioxide in the lungs.
3. Vasodilation of the coronary arteries - During exercise, the coronary arteries dilate to supply more oxygen-rich blood to the heart muscle.

While end systolic volume, total peripheral resistance, and diastolic pressure typically decrease during exercise, the blood pressure can show variability. For example, systolic pressure often increases during exercise to help propel the blood more effectively throughout the body.