How Does Our Heart Work?

Question 1

What are the main functions of the circulatory system?

Transports:

Answer 1

Oxygen, nutruents, wastes, and hormones.

Question 2

What are the main functions of the circulatory system?

Protects Against:

Answer 2

Blood loss, disease causing microbes, toxic substances.

Question 3

What are the main functions of the circulatory system?

Temperature Regulation:

Answer 3

Heat is distributed all over the body.

Question 4

What are the main structures?

Blood - Carry

Answer 4

Red blood cells – carry gases
White blood cells - immunity
Platelets - clotting
Plasma – water with dissolved nutrients, wastes, hormones, gases and many other materials (generates blood pressure)

Question 5

What are the main structures?

Blood Vessels - Roadways

Answer 5

Arteries –away from heart to tissues (generates blood pressure)
Capillaries – through tissues
Veins – back to the heart from the tissues

Question 6

What are the main structures?

Heart - pump blood

Answer 6

Generates blood pressure

Question 7

What are the structures of the heart and how does it cause circulation of the blood around the body?

Answer 7

Left - Oxygenated
Right - Deoxygenated
vena cavae → right atrium → right ventricle → pulmonary trunk → pulmanary arteries → lungs → pulmonary veins → left atrium → left ventircle → aorta → body

Question 8

What makes the heart sounds?

Answer 8

First second (lub) is the atrioventricular/cuspid valves snapping shut. Second sound (dub) is the semilunar valves snapping shut.

Question 9

How does the heartbeat?

Answer 9

Sinoatrial (SA) node sends electrical signal to the Atrioventrical (AV) node - goes into the AV bundle which splits and causes contraction of the ventricles.

Question 10

How do we measure heartrate?

Answer 10

Neck or Wrist (Major Artery). Actully measuring the expansion and relaxation of the artery.