IB Ventilatory/Circulatory quiz 2

Where does gas exchange occur in the lungs?

• Trachea

• Bronchi

• Alveoli

• Bronchioles

Homeostasis is defined as:

• The maintenance of a constant internal environment

• The process of gas exchange in the lungs

• The process of removing by-products.

• The amount of blood being pumped through the body at a given time

Where are the breathing and cardiac centers found in the brain?

• Cerebellum

• Corpus Callosum

• Medulla Oblongata

• Hypothalamus

Which of the following begins intrinsic excitation of the heart?

• Sinoatrial node

• Adrenaline

• Chemoreceptors

• Parasympathetic nervous system

Which are the units when measuring an athlete’s blood pressure?

• ml kg–1 min–1

• L min–1

• ml min–1

• mmHg

What does the elevated breathing rate after exercise allow the body to do?

• To lower the oxygen debt

• To increase the pH of the blood

• To bring back breathing to homeostasis

• All of the above

Which is a principal structure of the ventilatory system?

• Pulmonary artery

• Trachea

• Pulmonary valve

• Capillary

What is vital capacity (VC)?

• Additional inspired air over and above tidal volume.

• Volume of air breathed in and out in any one breath.

• Inflow and outflow of air between the atmosphere and the lungs.

• Maximum volume of air that can be exhaled after a maximum inhalation.

Which gases are exchanged at the alveoli?

• Oxygen and nitrogen

• Oxygen and carbon dioxide and nitrogen

• Oxygen only

• Oxygen and carbon dioxide

What is the relationship between heart rate, cardiac output and stroke volume?

• Cardiac output = stroke volume x heart rate

• Cardiac output = stroke volume + heart rate

• Cardiac output = stroke volume − heart rate

• Cardiac output = stroke volume ÷ heart rate