Best Upper Body Exercises At Gym

Best Upper Body Exercises At Gym

Nitric oxide A gas released by the endothelial cells to promote blood flow. The capacity of these cells to release nitric oxide is an important marker of good health.

Capillaries Very small blood vessels that distribute blood to all parts of the body.

Coronary arteries A pair of large blood vessels that branch off the aorta and supply the heart muscle with oxygenated blood.

Respiratory system The lungs, air passages, and breathing muscles; supplies oxygen to the body and removes carbon dioxide.

Alveoli Tiny air sacs in the lungs that allow the exchange of oxygen and carbon dioxide between the lungs and blood.

In a healthy adult, measured in millimeters of mercury, is 120 systolic and 80 diastolic (120/80).

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During exercise, the demands on the cardiorespiratory system increase. Body cells, particularly working muscles, need to obtain more oxygen and fuel and to eliminate more waste products. To meet these demands, your body makes the following changes:

• Heart rate increases up to 170-210 beats per minute during intense exercise.

• The heart’s stroke volume increases, meaning that the heart pumps out more blood with each beat.

• The heart pumps and circulates more blood per minute as a result of the faster heart rate and greater stroke volume. During exercise, this cardiac output increases to 20 or more quarts per minute, compared to about 5 quarts per minute at rest.

• Blood flow changes, so as much as 85-90% of the blood may be delivered to working muscles. At rest, about 15-20% of blood is distributed to the skeletal muscles.

• Systolic blood pressure increases, while diastolic blood pressure holds steady or declines slightly. A typical exercise blood pressure might be 175/65.

• To oxygenate this increased blood flow, you take deeper breaths and breathe faster, up to 40-60 breaths per minute.

All of these changes are controlled and coordinated by special centers in the brain, which use the nervous system and chemical messengers to control the process.

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