Download presentation
Presentation is loading. Please wait.
Published byNeil Cobb Modified over 8 years ago
1
Circulatory System
2
Components of the Circulatory System – Heart – Blood – Blood vessels: arteries; veins, capillaries
3
Functions of Circulatory System Transports important substances, such as oxygen, nutrients, and disease fighting materials produced by the immune system
4
Functions of Circulatory System Blood carries wastes away from organs Blood clotting
5
Functions of Circulatory System Heart pumps blood Distributes heat throughout the body to help regulate temperature
6
Blood Vessels Arteries: large, muscular vessels that carry blood away from the heart
7
Blood Vessels – Blood pressure is the force that is exerted against the walls of the artery – Hypertension (high blood pressure) Places a strain on arterial walls, increasing the chance that a vessel will burst
8
Blood Vessels Capillaries – A network of tiny blood vessels – This is a very extensive network…. – There are 100 trillion cells in the body. Each one of them lies within 125 nanometers of a capillary – Only one cell thick, allows for the rapid exchange of materials
9
Blood Vessels Veins: large blood vessels that carry blood to the heart – Thinner and less muscular than artery – Valves prevent blood from backing up
10
Heart A muscular organ that is about as large as your first and located in the center of your chest. Hollow Pumps blood throughout the body – Pumps oxygenated blood to organs – Pumps deoxygenated blood to lungs
11
Heart Structure of the Heart – Cardiac muscle – 4 chambers (compartments) 2 chambers at the top: Atria – Receive blood returning to the heart 2 chambers at the bottom: Ventricles – Pump blood away from the heart
12
Heart How the heart beats – 2 main phases 1 st phase: the atria fill will blood, contract and the ventricles fill with blood 2 nd phase: ventricles contract to pump blood out of heart – The heart works in rhythm A group of cells send out signals that tell the muscles to contract
13
Blood Flow It flows in 2 loops – 1 st : travels from heart to lungs and back to heart – 2 nd : travels from heart to body and back to heart – The right side of the heart pumps deoxygenated blood to the lungs – The left side of heart pumps oxygenated blood to body
14
Heart Coronary Circulation – Supplies blood to the heart – If coronary artery is blocked by blood clot or artherosclerosis a heart attack will result
15
Pulse – Heart pulses about 70 times a minute Blood Pressure – A measure of how much pressure is exerted against the vessel walls by the blood – Healthy 120/80
16
Blood Components of Blood – Plasma: liquid medium (clear, yellowish fluid) – Red Blood Cells: carry oxygen to body’s cells Contain hemoglobin (iron containing protein) that carries oxygen
17
Blood – Platelets Cell fragments that play an important role in forming blood clots – White Blood Cells The body’s disease fighters
18
Blood Circulatory System Disorders – Artherosclerosis: blocked arteries Signs: high blood pressure, high cholesterol Can lead to heart attack or stroke Sickle Cell disease – The red blood cells are shaped like sickles and can not carry oxygen as well
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.