dho unit 6:8 anatomy and physiology circulatory system
TRANSCRIPT
DHO Unit 6:8 Anatomy and Physiology
Circulatory System
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6:8 Circulatory SystemAKA the cardiovascular system
Consists of heart, blood vessels, and blood
Transports oxygen and nutrients to body cells
Transports carbon dioxide and metabolic materials away from the body cells
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Heart
Muscular, hollow organ functions as pump Size of a closed fist Location
– Slightly to the left of the sternum– Between the 4th and 5th intercostal
Heart Exterior and Interior
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Anatomy Heart chambers
– Right Atrium– Right Ventricle– Left Atrium– Left Ventricle
Septum Valves
– Tricuspid– Pulmonary– Mitral– Aortic
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Layers of the Heart
Endocardium Innermost Layer
Myocardium Thickest Layer
Pericardium Membrane that covers the heart
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Blood Vessels
Blood carried throughout body in blood vessels
– Arteries
– Capillaries
– Veins
Blood Vessel Disection
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Blood Flow Through the Body(Systemic Circulation)
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Blood Flow
Normal Blood Flow Through the Heart
Double Click this link to go to the National Institute of Health’s page to see how normal blood flow looks and sounds ….
Be patient! Give it a second to load.
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Taking Your Pulse When your heart pumps blood through your arteries, it creates a pulse that you can
feel on the arteries close to the skin's surface. For example, you can feel the pulse on the artery inside of your wrist, below your thumb.
You can count how many times your heart beats by taking your pulse. You will need a watch with a second hand (or look at the clocks above each door!).
To find your pulse, gently place your index and middle fingers on the artery located on the inner wrist of either arm, below your thumb. You should feel a pulsing or tapping against your fingers.
Watch the second hand and count the number of pulses you feel in 30 seconds. Double that number to find out your heart rate or pulse for 1 minute.
The usual resting pulse for an adult is 60 to 100 beats per minute. To find your resting pulse, count your pulse after you have been sitting or resting quietly for at least 10 minutes.
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Blood
Average adult: 4-6 quarts Blood circulates continuously throughout the
body Transports many substances Plasma Blood cells
– Erythrocytes or red blood cells– Leukocytes or white blood cells– Thrombocytes
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Diseases and Abnormal ConditionsArteriosclerosis and Atherosclerosis
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More Diseases and Abnormal Conditions
Anemia Aneurysm Arrhythmias Congestive heart failure (CHF) Embolus Hemophilia Hypertension Leukemia Myocardial infarction – heart attack Phlebitis Varicose veins
6:9 Lymphatic System
Removes waste and excess fluid from the tissues
– Lymph
– Lymphatic vessels
– Lymph nodes
– Lymphatic ducts
– Lymph tissue
– Spleen
– Thymus
The lymphatic system is part of the circulatory system, comprising a network of lymphatic vessels that carry a clear fluid called lymph (from
Latin lympha meaning water) directionally towards the heart.
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Lymphatic and Venous Systems Working Together
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Diseases and AbnormalConditions
Adenitis Hodgkin’s disease Lymphangitis Splenomegaly Tonsillitis