Circulatory System. Circulatory System
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1 Circulatory System Transportation system of the body There are two types of circulatory systems: 1. Open Circulatory System pumps blood to open ended vessels into the body cavities containing organs, then drains the cavity. e.g. insects 2. Closed Circulatory System pumps blood through a series of closed vessels between the heart and the rest of the body organs.
2 4 Functions of the Circulatory System 1. Transportation of oxygen and carbon dioxide 2. Distribution of nutrients and transport of wastes 3. Maintenance of body temperature 4. Circulation of hormones 2 Systems ("loops") Pulmonary Circuit (LUNGS) system of blood vessels that carries deoxygenated blood to lungs and oxygenated blood back to the heart Systemic Circuit (BODY) system of blood vessels that carries oxygenated blood to the body tissues and deoxygenated blood back to the heart Pulmonary Systemic
3 Systemic System Pulmonary System body cells lungs
4 Components of a Circulatory System The Heart a pump about the size of your fist located behind the lungs and slightly to the left covered by a sac of tissue, called the pericardium, that contains fluid that reduces friction the human heart has 4 chambers: 2 atria and two ventricles a wall called a septum separates the two halves of the heart that pump blood through the two loops. Valves control the flow of blood.
5 The Blood a fluid Has 4 components: Plasma: the liquid part, makes up about 55% of blood and is 92% water is light yellow in colour contains sugars, minerals, wastes, amino acids, vitamins, salts and hormones
6 Circulatory System Red Blood Cells (RBC) also called erythrocytes you have about a trillion primary function is to carry oxygen throughout the body contain hemoglobin molecules that bind oxygen. Iron is a key component of hemoglobin and gives blood its red colour have a biconcave disc shape they do not have a nucleus average life span is 4 months produced in the bone marrow and stored in the spleen anemia results if a person is short on hemoglobin
7 White Blood Cells (WBC) also called leukocytes they are an important part of the immune system (help defend body from disease and infection) there are 5 types based on size, shape and appearance they can sqeeze through the walls of capillaries and lymph vessels and wander (patrol) the body tissues pus sometimes forms at the site of a cut (or pimple!) and is a combination of WBC and dead bacteria
8 Circulatory System Platelets are important to the clotting of blood much smaller than RBC and WBC surrounded by a membrane, but not considered cells the disease hemophilia results if a person's blood does not clot properly aspirin is a blood thinner since it prevents platelets from sticking together and forming a clot
9 The Vessels Tubes along which the blood travels Criteria Artery Vein Capillary diagram flexibility direction of flow valves? thickness of walls pressure
10 Path of Blood
11 Heart Sounds and Pressure the heart continually contracts and relaxes as a part of the cardiac cycle the relaxation portion is called diastole the contraction portion is called systole. During this time the ventricles contract pushing blood into the arteries. Pulse is the change in diameter of the arteries that can be felt on the body's surface following heart contractions Blood pressure is the force of the blood on the walls of the arteries Measured with a sphygmomanometer Cardiac Output is the amount of blood per beat (also known as the stroke volume) multiplied by the heart rate. Example: What is the cardiac output if the stroke volume is 80ml/beat and the heart rate is 75 beats/min?
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13 More About the Human Heart the heart has its own supply of oxygen known as the coronary circulation, including the coronary arteries and its branches if a person has a sudden blockage in these arteries it is known as a heart attack heart disease is a slower process where these arteries are depriving the heart of oxygen. Some of the contributing factors include: smoking, stress, lack of exercise and a highcholesterol diet a heart mumur is caused when one of the heart valves does not open or close properly
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