Class test

The circulatory system transports (a)   and (b)   to the working muscles.

• oxygen

• nutrients

• carbon dioxide

• hormones

As a result of regular and appropriate exercise, physical changes take place within the circulatory system. How do these changes help improve aerobic performance?

• By increasing the heart's efficiency and oxygen delivery to muscles

• By decreasing the heart rate and blood pressure

• By reducing the need for oxygen in muscles

• By increasing the production of lactic acid

When a person starts doing strenuous exercise, what is the immediate response of the heart?

• The heart rate increases

• The heart rate decreases

• The heart stops

• The heart rate remains the same

Complete the flow of blood through the cardiovascular system during physical activity: Pulmonary circuit, deoxygenated blood from working muscles → _______ → _______ → _______ → Lungs → _______ → _______ → _______ → Systemic circuit, oxygenated blood to working muscles.

• Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Pulmonary veins

• Left atrium → Left ventricle → Pulmonary veins → Lungs → Right atrium → Right ventricle → Pulmonary artery

• Superior vena Cava-Right atrium- Right ventricle-pulmonary artery-lungs-pulmonary vein-left atrium- left ventricle-aorta

Complete the sentences by selecting the correct words from the list below. aerobic, endurance, fast, few, high, quickly, anaerobic, explosive, slow, lot, low, slowly. Type II muscle fibres are also known as ____________________ twitch muscle fibres. They are designed for ____________________ sport events as they contract ____________________. Type II muscle fibres contain a ____________________ content of myoglobin and a ____________________ mitochondria and blood capillaries. They rely on ____________________ respiration for the release of energy.

• fast, explosive, quickly, low, few, anaerobic

• slow, endurance, slowly, high, lot, aerobic

• fast, endurance, quickly, high, few, aerobic

• slow, explosive, slowly, low, lot, anaerobic

What does cardiac muscle move?

• Blood

• Bones

• Lungs

• Skin

Smooth muscle moves:

• bones

• blood

• food

• joints

Complete the sentence: _______ is the movement of gas from an area of high concentration to an area of low concentration.

• Carbon dioxide

• Diffusion

• Oxygen

• Evaporation

After breathing in, the alveoli have a high concentration of _______ which transfers into the blood capillaries, while _______ transfers from the capillaries to the alveoli.

• Carbon dioxide, Oxygen

• Oxygen, Carbon dioxide

• Diffusion, Carbon dioxide

• Diffusion, Oxygen

Describe the role of diffusion in the exchange of gases at the alveoli in the lungs.

• Diffusion in alveoli is the passive movement of oxygen from high to low concentration into the blood.

• Diffusion in alveoli requires energy to transport carbon dioxide out of the blood.

• Diffusion in alveoli involves the active transport of blood cells across the membrane.

• Diffusion in alveoli is the movement of air molecules using energy.