Practice 2.2.4. Describe the intrinsic and extrinsic regulation of heart rate and the sequence of excitation of the heart muscle. with authentic IB Sports, exercise and health science (SEHS - Old) exam questions for both SL and HL students. This question bank mirrors Paper 1, 2, 3 structure, covering key topics like core principles, advanced applications, and practical problem-solving. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Which option accurately outlines the sequence of heart muscle excitation?
Where in the heart is the electrical impulse generated for contraction?
Describe the extrinsic regulation of the sinoatrial (SA) node as an athlete begins a warm-up.
Outline strategies a long-distance runner could use to reduce the risk of infection.
Suggest how an aerobic 1500 m endurance athlete uses the principles of overload.
Describe two functions of the skin.
Identify one effect on the immune system of training for a long-distance race.
Evaluate the multistage fitness test as a method of assessing aerobic capacity in a long-distance runner.
What describes the sequence of stimulation of the cardiac muscle?
State the role of thrombocytes in response to a skin incision.
Describe the route of the electrical signal during stimulation of the cardiac muscle.