BTEC Sport Level 3 Unit 1 Anatomy & Physiology L.A.C

The respiratory system provides __________ to body tissues and removes waste products.

• Carbon dioxide

• Lactic-acid

• Oxygen

• Water

Main function of the respiratory system are...

• Pulmonary circulation & gas exchange

• Pulmonary ventilation & gas exchange

• Thermoregulation & gas exchange

The chamber of the chest is known as the...

• Lungs

• Thoracic cavity

• Diaphragm

• Pharynx

The role of the intercostal muscles during INSPIRATION.

• External intercostals CONTRACT and internal intercostals RELAX. This lifts the ribs/thoracic cavity UP and OUT.

• External intercostals RELAX and internal intercostals CONTRACT. This lifts the ribs/thoracic cavity DOWN and IN.

• External intercostals RELAX and internal intercostals CONTRACT. This lifts the ribs/thoracic cavity UP and OUT.

• External intercostals CONTRACT and internal intercostals RELAX. This lifts the ribs/thoracic cavity DOWN and IN.

The role of the intercostal muscles during EXPIRATION.

• External intercostals CONTRACT and internal intercostals RELAX. This lifts the ribs/thoracic cavity UP and OUT.

• External intercostals RELAX and internal intercostals CONTRACT. This lifts the ribs/thoracic cavity DOWN and IN.

• External intercostals RELAX and internal intercostals CONTRACT. This lifts the ribs/thoracic cavity UP and OUT.

• External intercostals CONTRACT and internal intercostals RELAX. This lifts the ribs/thoracic cavity DOWN and IN.

Select the correct answer which best describes the breathing mechanics during INSPIRATION.

• Ribs move down and in, diaphragm relaxes and moves upwards, chest decreases, external intercostal muscles relax.

• Ribs move down and in, diaphragm contracts and moves downwards, chest decreases, external intercostal muscles relax.

• Ribs move up and out, diaphragm relaxes and moves upwards, chest increases, external intercostal muscles relax.

• Ribs move up and out, diaphragm contracts and moves down/flattens, chest expands, external intercostal muscles contract.

Explain the process of gas exchange at the alveoli.

• Concentration of oxygen in the alveoli is high. Concentration of oxygen in the blood is low. This creates a steeper diffusion gradient/ oxygen diffuses quicker. Oxygen moves from the alveoli into the blood.

• Concentration of oxygen in the alveoli is low. Concentration of oxygen in the blood is high. This creates a steeper diffusion gradient/ oxygen diffuses quicker. Oxygen moves from the blood into the alveoli.

• Concentration of oxygen in the alveoli is the same as the concentration of oxygen in the blood. This removes the diffusion gradient. Oxygen does not move anywhere.

The respiratory control centre located in the _________________ ___________________ of the brain controls breathing.

• Chemo-receptor

• Medulla Oblongata

• Lungs

• Respiratory muscles

Breathing rate is...

• An increase in the number of times you breathe per minute.

• An increase in the number of times you breathe per hour.

• An increase in the number of times you breathe during exercise.

• An increase in the number of times you breathe during rest.

Chemoreceptors which detect changes...

• in blood pH (acidity of blood)

• in blood viscosity (thickness of blood)

• in blood temperature

• in blood volume