Circulatory System

Chapter 2.2 Notes Part 2

Parts of the Heart

• Heart – left-right are reversed in diagrams (diagram p. 88)

• pumps 4L of blood/minute• muscular organ in the C. sys.• 4 chambers – top – atria – bottom – ventricles• Atria – collect blood – Ventricles – pump blood• Left Ventricle – pumps blood to the body• Right Ventricle - pumps blood to the lungs

• Valves – found between chambers – blood only flows one way

• When valves close – we hear the “lub-dub”

Inside the Human Heart

Three Types of Blood Vessels

• Blood carried from heart to your body and back again using blood vessels:

• Three types of blood vessels:• Arteries• Capillaries• Veins

Inside of the blood vessels

Arteries

• Arteries – away from the heart • (aorta to arterioles)• Red – oxygenated blood • Thick walls due to pressure• Pulmonary artery – only artery to carry

deoxygenated blood – to lungs

Veins

• Veins – to the heart • (superior/anterior vena cava – venules)• Blue – deoxygenated blood • Thinner and have valves• Pulmonary vein – only vein to carry

oxygenated blood - from lungs

Capillaries

• Capillaries – one cell thick • mass between veins and arteries

• where nutrients/oxygen/glucose are exchanged to • the cells from your blood

What does Our Blood Do?

• transports oxygen, nutrients, & water to your cells

• carries carbon dioxide & wastes away from your cells

Components of Blood

• Body contains 5L of blood• 55% = plasma – clear, yellowish fluid

containing proteins and minerals• 45% = red blood cells, white blood

cells, & platelets

What Does Each Part Do?

• Red blood cells are made in bone marrow, liver, and spleen

• Red blood cells contain haemoglobin and are responsible for transporting the O2 and CO2

• White blood cells – fight infection• Platelets – clot blood

Your Turn!

• Textbook Questions P. 95 • Circulatory System stuff #1-6, 11, 13, 15• Quiz next class!