Zusammenfassung der Ressource
Circulatory System
- Heart
- Diagram:
- Size of clenches fist
- Between lungs, under sternum, tilted to left
- 4 chambers: 2 ventricles (receiving), 2 atria (pumping out)
- Heart rate: Child - 90 -120, Adult - 72
- lub-DUB sound made by valves opening and closing
- Valves: prevent backflow of blood - move in 1 direction
- Blood Vessels
- Arteries
- Arterioles
- Walls: Very thick (high pressure)
- Blood: Oxygenated
- Direction: From Heart To Body
- Veins
- Walls: Thick (<Arteries)
- Blood: Deoxygenated
- Direction: To Heart From Body
- Extras: Have valves
- Venules
- Capillaries
- Walls: Thin - transfer nutrients, gasses, etc.
- Blood: Both
- Direction: Both
- Blood
- Plasma
- RBC
- WBC
- Platelets
- Cell fragments
- Clotting
- Fight harmful microbes and bacteria
- Part of immune system
- No nucleus - biconcave (more space for gasses)
- Transports gas
- Red - Haemoglobin pigment (iron component)
- Transport medium
- Clear
- Fluid Tissue
- Diseases
- High Blood Pressure (Hypertension)
- Heart Attack
- Stroke
- Transports - nutrients, oxygen to
all body cells - waste substances
to excretory organs
- Kidneys, lungs, skin, colon