Question

Define systole and diastole. What is an ischemic stroke and a hemorrhagic stroke? What are the benefits of regular physical activity on the cardiovascular system? What are antioxidants and what do they do?

Answer 1

1 .Definition of systole and diastole ;

They had two phases of cardiaccycle.they occurs as heart beats, pumping blood through a blood vessels that carry blood to every part of the body .

Systole:

It occurs when the heart contracts to pump blood out

Diastole:

It occurs when heart relaxes after contraction.

2.ischemic and hemorragic stroke ;

Ischemic stroke ,

It was caused by blood clot that blocks or plugs a blood vessels the brain .when an artery to the brain is blocked .due to this blood carries oxygen and nutrients through the arteries alblocked.so brain cells can't make enough energy to make function or work.

Hemorragic stroke ;

It is a aneurysm burst or a weakened blood vessel leak. Blood will leak into or around the brain and creates swelling and pressure.it will leads to damaging cells and tissues in the brain.

Benefits of regular physical activity on the cardiovascular system ;

It provides adequate oxygen and nutrients to the heart muscles

Increases stroke volume of the cardiac cycle

It increases blood flow to heart muscles and lungs

Improve stamina

Keep the arteries clear

Decreases blood pressure and blood sugar level

Improve good cholesterol

Decreases fatty deposition in the arteries.

Antioxidants means:

A substance that inhibit oxidation .such as vitamin c and E that removes potentially damaged oxidizing agents in the living organism.

Antioxidants activity,

It will scavenging the species that will initiate preoxidation , quenching, and breaking free radical chain reactions...