Circulatory System

systemic circulation

Carries blood to body and back, Is initiated by the left side of the heart.

Septum

Is a wall dividing the right and left sides.

3 major components of the circulatory system

1. Heart
2. Blood vessels
3. Blood

The heart has four chambers

left atrium, left ventricle, right atrium, right ventricle

Passage of Blood Through the Heart Blood follows this sequence through the heart

superior/inferior vena cava --> right atrium--> right ventricle --> pulmonary arteries --> lungs --> pulmonary veins --> left atrium --> left ventricle --> aorta --> to the body 2

pulmonary circulation

carries blood to lungs and back, initiated by the right sided of the heart

3 types of blood vessels

1. arteries/arterioles
2. Capillaries
3. Veins

arteries (arterioles)

-carries blood away from the heart
-have thick muscular walls
-all arteries (pulmonary artery) carry oxygenated blood

capillaries

-nutrient and gas exchange occurs
-joins the arteries/arterioles with the veins/venules
-have only one cell thick to allow exchange of gases

Veins (venules)

-carries blood toward the heart
-drain blood from capillairies
-all veins (except pulmonary veins) carry deoxygenated blood
-have thin walls and values

2 elements of Blood

1. fluid portion
2. solid portion

fluid portion of blood

composed of 92% water, rest is mae up dissolved ggases proteins, sugars, vitamins, minerals, and waste.

solid portion of blood

red blood cells - carries O₂ and CO₂ to and from cells
white blood cells - helps fight off infections
platelets - helps to clot blood

Disorders of the circulatory system

-Heart attack
-stroke
-hypertension

What part of the heart is this?

Aorta

Right ventrical

Right atrium

Left ventricle

superior vena cava

Inferior vena cava

Pulmonary vein

Left atrium

septum

Pulmonary artery