7.3 The heart, energy and exercise Controlling the heart The heart is myogenic – it contracts and relaxes automatically without stimulation from nerves to pump blood around the body. It is specific and made of specialised tissue called cardiac muscle. Rhythmic...
7.4 Health, exercise and sport Benefits of exercise Increasing arterial vasodilation lowers blood pressure and reduces the risk of cardiovascular disease and stroke Increases the level of blood HDLs which transport cholesterol to the liver where it is broken down...
Topic 7: Run for your life: 7.1 Cellular respiration Respiration = The chemical process of releasing energy from organic compounds (respiratory substrates) such as glucose through oxidation. The energy released is used to combine ADP with inorganic phosphate to...
7.2 Muscles and movement Structure and function of muscles Muscle tissue is made of specialised cells that use energy from the hydrolysis of ATP to become shorter by contraction. Striated (skeletal/voluntary) muscle attaches to the bones by tendons and appears...