Chapter 15 Respiratory System

After entering the bloodstream, a CO2 molecule may be first converted to a molecule of _________.

• carbonic acid

• carbaminohemoglobin

• carbon monoxide

• carbonic anhydrase

At a given PO2, hemoglobin will release additional oxygen if ___________.

• pH increases or temperature decreases

• pH increases or temperature increases

• pH decreases or temperature decreases

• pH decreases or temperature increases

Tags

NGSS.HS-LS1-3

Which organ system integrates with the respiratory system because it contains the tonsils, which protect against infection at the entrance to the respiratory tract?

• Integumentary system

• Lymphatic system

• Endocrine system

• Muscular system

Which of the following body systems integrates with the respiratory system to secrete chemicals such as epinephrine and norepinephrine that stimulate respiratory activity and dilate respiratory passageways?

• Lymphatic system

• Endocrine system

• Cardiovascular system

• Nervous system

As the volume of the lungs increases, ____________.

• both the DRG and VRG centers are inhibited

• the DRG center is gradually inhibited, and the VRG expiratory center is stimulated

• the DRG center is gradually stimulated, and the VRG center is inhibited

• both the DRG and VRG centers are stimulated

Tags

NGSS.HS-LS1-3

During expiration, the departing _________ mixes with air in the __________.

• nitrogen; alveoli

• oxygen; alveolar sac

• alveolar air; anatomic dead space

• atmospheric air; trachea

When the PCO2 increases, the bronchioles ____; as a result, airflow is directed to lobules in which the PCO2 is ____.

• constricts; low

• dilate; high

• constricts; high

• dilate; low

Tags

NGSS.HS-LS1-3

Blood delivered by which of the following structures has a lower PO2 and a higher PCO2 than alveolar air?

• Pulmonary veins

• Pulmonary arteries

• Alveolar capillaries

• Pulmonary venules

In the center of heme units, oxygen molecules are bound to _________.

• Sodium ions

• Calcium ions

• Chloride ions

• Iron ions

In saturated exhaled air, which of the following gases has the highest partial pressure?

• Carbon dioxide

• Water vapor

• Oxygen

• Nitrogen

Tags

NGSS.HS-PS1-5