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von Lysander K.

What are the 4 chambers of the heart?

Heart Fun Facts

Your Heart Will Continue to Beat for a short period even if it's Removed From Your Body
Over your lifetime, your heart will pump 1 million barrels of blood … enough to fill 2 oil super tankers
Average man's heart = 10 ounces HR = 70 beats/minute Average woman's heart = 8 ounces. HR = 78 beats/minute
Your Heart is Not on the Left Side of Your Chest
It takes about 45 seconds for blood to circulate from the heart, all around the body, and back
Heart beats 100,000 times a day, and almost one million times a week

What are the five different types of blood vessels.

Arteries are large blood vessels that carry blood AWAY from the heart. What else is important.

Arterioles are smaller branches of arteries, but also carry blood AWAY from heart. What else is important ?

Which parts does a artery blood vessels have?

Capillaries are the smallest blood vessels in our body. What else is important?

Capillaries are spread throughout our entire body

Site of gas exchange

Large Surface Area / Low velocity

Connects vessels between arterioles and venules.

Venules are smaller branches of veins that collect blood from the body tissues and carry it to the larger vein. What else is important?

Usually carry deoxygenated blood that has just dropped off oxygen to body tissues.

Veins will look blue due to the blue colour of deoxygenated blood and can be found more superficial in our body (near the skin).

(Blue colour myth)

Veins are large blood vessels, but carry blood TOWARDS the heart. What else is important.

They still have a muscular layer, but it is less thick than the arteries.

What are the four valves in our heart?

Semilunar valves

Atrioventricular valves (AV valves)

What are the major arteries and Veins?

What is the difference between systole and diastole?

What is the lub-dupp heart rate?

1st ~ the ATRIA CONTRACT (the "lub" part) while the ventricles are relaxed.

2nd ~ The VENTRICLES CONTRACT (the "-DUPP" part) while the atria relax.

What happens during the circlatory cycle?

Both atria contract at the same time (systole) while the ventricles are relaxed (diastole).
Both atria relax (diastole) as the ventricles contract (systole).
Both the atria and ventricles are relaxed (diastole).
Repeat.

How does the heart know when to beat?

The sinoatrial (SA) node. Located at the upper end of the right atrium.
The atrioventricular (AV) node. Located at the bottom side of the right atrium.
The Purkinje fibers located in the bases of the ventricles.

Which disseas come from the wrong blood pressure?

HYPOTENSION: lower blood pressure than normal.

HYPERTENSION: higher blood pressure than normal.

Vasodilation vs Vasoconstriction explain the differences?

Vasodilation: is the widening of your blood vessels, causes an increase in blood flow
- Causes a decrease in blood pressure
- Drugs, alcohol, medication, exercise, inflammation, + temperature
Vasoconstriction: is the narrowing of blood vessels
- Causes an increase in blood pressure
- Drugs, alcohol, - temperature, eating salty snacks, loss of fluids, ANS,