Gas exchange and Circulation (week 3 and 4)

Which of the following is not a structure for gas exchange in plants?

• Stomata

• Lenticels

• Flowers

• Pneumatophores

Amphibians ventilate their lungs by

• Countercurrent flow

• Positive pressure breathing

• Negative pressure breathing

• A system of air sacs that act as blowers to keep air flowing through

What keeps mucus and dirt out of the lungs?

• Diaphragm

• Nostrils

• Trachea

• Cilia

Which of the following respiratory surfaces occurs in insects like grasshoppers?

• Lungs

• Tracheal exchange system

• Gills

• Gills

When the diaphragm contracts and moves down, the lungs are?

• Expanding with air

• Shrinking and pushing air out

• Inflated like balloons filled with air

• Dilating both bronchioles and alveoli

With rare exceptions, how does the majority of the oxygen transported in the blood of vertebrates?

• By binding to plasma protein

• By binding to hemoglobin in erythrocytes

• As dissolved gas in the cytoplasm of erythrocytes

• As a component of large organic molecules that are broken down by the cells

Which of the following is brought about by infection and involves inflammation and fluid buildup in the lungs?

• Emphysema

• Pneumonia    

• Asthma

• Cough

The group of vertebrates that relies on gas exchange across the skin as well as at the lungs to maintain sufficient blood oxygen levels is?

• The fishes

• The reptiles

• The amphibians

• The mammals

Movement of air in and out of the lungs is due to___.

• Diaphragm contracts and flattens.

• Inhalation and Exhalation

• Difference in pressure

• External intercoastal muscles contract and internal intercoastal muscle relax.

Which of the following statements is TRUE?

• Only diaphragm, intercostal muscles and sternum, is involved in inhalation and exhalation

• During inhalation, external intercostal muscles relax and internal intercostal muscles contract.

• Sternum move upward and forward exhalation

• Changes of the volume of cavity are workings of only the intercostal muscles and diaphragm