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Circulatory system.

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Presentation on theme: "Circulatory system."— Presentation transcript:

1 Circulatory system

2 Function of the circulatory system
Primary function: transport of nutrients to/from somatic cells Other functions: clotting, waste removal

3 Circulatory system components
Blood vessels The heart Blood

4 Blood Plasma Blood cells water proteins (eg. insulin) micronutrients
red (erythrocytes) platelets (thrombocytes) white (leukocytes)

5 Blood White blood cells help fight infection. Red blood cells carry oxygen to cells and carbon dioxide waste for elimination. Platelets help stop blood flowing by forming clots. Nutrients and waste enter/leave cells via passive (eg. diffusion) and active transport


7 What colour is your blood?

8 Pulmonary circuit Systemic circuit

9 Anatomy of blood vessels
Arteries, arterioles vessels that carry nutrients away from the heart Capillaries smallest blood vessels that are one cell layer thick Veins, venules vessels that carry nutrients to the heart

10 Anatomy of blood vessels
FYI: Blood vessels are lined with muscle and can constrict or dilate to modify blood pressure

11 Nutrient exchange

12 (to body) (from body) (to lungs) (to lungs) (from lungs) (from lungs) (from body)

13 Heartbeat The “thump-thump” of your heart is the valves closing
Cardiac muscle tissue in the heart contracts on its own without nervous stimulation – this is called being myogenic A region in the right atrial wall acts as a pacemaker and initiates each contraction by sending its own impulse This impulse is distributed across the heart and sequentially triggers the proper chamber contractions

14 Heartbeat

15 Blood pressure measurements
Blood pressure is a measure of the force of blood pressing against the arterial/venule wall It is a measure of 2 pressures: Systolic pressure (when ventricles contract – highest pressure) Diastolic pressure (when ventricles relax – lowest pressure) This is called a sphygmomanometer This is called a stethoscope

16 Try this… Pg. 334, #1 – 3, 5 – 6 & 8

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