IB SEHS Topic 2

What describes the sequence of excitation of the heart muscle?

• Sinoatrial node → atrioventricular node → ventricles

• Atrioventricular node → ventricles → sinoatrial node

• Ventricles → atrioventricular node → sinoatrial node

• Ventricles → atrioventricular node → sinoatrial node

What cardiovascular adaptations can result from endurance training?

• Increased left ventricular volume and increased capillarization

• Decreased left ventricular volume and increased capillarization

• Decreased left ventricular volume and decreased arterio-venous oxygen difference

• Increased left ventricular volume and decreased arterio-venous oxygen difference

Which demonstrates how blood is redistributed to the working muscles during exercise?

• Pre-capillary sphincters of the working muscles constrict, and the arterioles of the working muscles dilate

• Pre-capillary sphincters of the working muscles dilate, and the arterioles of the working muscles constrict

• Pre-capillary sphincters of the working muscles dilate, and the arterioles of the working muscles dilate

• Pre-capillary sphincters of the working muscles constrict, and the arterioles of the working muscles constrict

Tags

NGSS.HS-LS1-3

Which is the function of platelets?

• Clot blood

• Deliver oxygen

• Produce antibodies

• Carry carbon dioxide

Describe how breathing is controlled during exercise (5 marks)

Tags

NGSS.HS-LS1-3

NGSS.HS-LS1-7

Explain how the mechanics of exhalation change from rest to exercise (6 marks)

Tags

NGSS.HS-LS1-3

Describe the exchange of carbon dioxide from the bloodstream during exercise (4 marks)

Tags

NGSS.HS-LS1-3

NGSS.HS-LS2-3

Explain how cardiac output is maintained during prolonged exercise (3 marks)

Tags

NGSS.HS-LS1-3

Describe long-term vascular adaptations to endurance training (4 marks)

Explain the redistribution of blood during exercise (3 marks)

Tags

NGSS.HS-LS1-3