PE 2020 - Unit 1 - AOS2 - SAC 2

Steady state usually occurs when:

• The difference in oxygen concentration in the lungs equals that of surrounding blood vessels

• Oxygen supply equals oxygen demand

• Stroke volume x heart rate = 220 - age

• There is a steady increase in oxygen supply as respiratory rate increases

When running on a treadmill that increases its speed every minute, which of the following is true:

• Heart rate will increase linearly until maximum intensity is reached

• Stroke volume will increase linearly until maximum intensity is reached

• Respiratory rate will increase linearly and plateau sub-maximally

• Tidal volume will increase linearly until maximum intensity is reached

Tidal Volume is a measure of:

• The amount of air breather in/out per breath

• The difference in oxygen concentration between the systemic and pulmonary circuits

• How much oxygen is leaving the heart via the systemic circuit

• The amount of blood pumped through the heart per beat

While running a marathon, when runners face an uphill section of the course their a-VO2 diff will:

• Remain unchanged

• Increase

• Decrease

• Plateau

During expiration, the:

• Inter-costal muscle tension remains unchanged

• Inter-costal muscles and diaphragm contract

• Diaphragm contracts and the inter-costal muscles relax

• Inter-costal muscles and diaphragm relax

Cholesterol is a naturally occurring substance in the body. Which statement about cholesterol is INCORRECT

• Good cholesterol is called HDL and is responsible for removing superfluous cholesterol from the arteries

• Saturated fats contain higher levels of LDL and contribute to higher levels of bad cholesterol.

• Physical activity has no role in controlling cholesterol in the body

• Oversupplies of cholesterol in arteries can lead to the development of plaque on artery walls

Asthma is a major inhibitor of physical activity if not managed properly. Which of the following statements best describes asthma?

• Asthma is most common in elderly people, causing great respiratory problems during simple tasks like walking or climbing stairs

• Asthma is a chronic condition of the oesophagus and prevents people fro swallowing effectively, resulting in indigestion during exercise

• Asthma causes the muscles in the bronchioles to tighten, swell and narrow in diameter, reducing the amount of air that can flow through them

• Asthma can only be treated by improving physical fitness

Which of the following diseases BEST describes the condition whereby the small arteries that supply the heart muscle with blood become blocked by fatty deposits?

• Hypertension

• Coronary Heart Disease

• Stroke

• Chronic Obstructive Pulmonary Disease

As exercise intensity increases, the tidal volume:

• Plateaus before increasing until VO2 max is reached

• Increases linearly up to VO2 max

• Remains unchanged

• Increases linearly and then plateaus at sub-maximal intensities

Endurance athletes, compared to untrained people, tend to have:

• Larger tidal volumes

• Greater respiratory rates

• Higher core temperatures

• Smaller stroke volumes