B5 Part 1
- Created by: WillDayy
- Created on: 11-04-16 16:36
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- B5 Part 1
- Bones and Cartlilage
- Bones
- Contain Bone Marrow - spongy substance producing blood cells
- Bones start off as cartilage - can grow & repair itself
- OSSIFICATION turns cartilage to bone - deposition of calcium & phosphorus
- Cartilage remains in bones even after growth has ended
- Osteoporosis - condition where calcium is lost from bones
- Bones
- Joints & muscles
- Joints
- Synovial joints - main type of joint e.g the Knee
- Bones held together by ligments - high tensile strength
- Ends of bones covered with cartilage - prevent bones rubbing against each other
- Synovial membrane releases synovial fluid -lubricates joint
- Ball & socket joint e.g hips / shoulders
- Move in all directions & rotate
- Hinge joint e.g knee / elbow
- Move backwards & forwards
- Synovial joints - main type of joint e.g the Knee
- Muscles
- Connect to bones via tendons
- Move bones by contracting at a joint
- Come in antagonistic pairs - while one muscle contracts the other will relax
- Causes movement in one direction
- Joints
- Blood
- Circulatory system
- Single circulatory system requires a single chambered heart
- Double circulatory systems require a two chambered heart
- Maintains higher blood pressure
- Blood can be pumped the whole way around the body and faster
- Maintains higher blood pressure
- Cardiac Cycle & circulation
- Atrio-ventricular and semi lunar valves prevent blood backflow
- 1) Blood flows into aria
- 2) Atria contract - blood flows into ventricles
- 3) Ventricles contract blood flows to aorta and pulmonary artery
- 2) Atria contract - blood flows into ventricles
- Circulatory system
- Bones and Cartlilage
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