Exam 3 Practice Questions Flashcards
What does the lymphatic system do?
-provides a structural basis for the immune system
-returns interstitial fluid to the vascular system
How does interstitial fluid enter the lymphatic capillaries?
passive opening of flaplike minivalves
Where are mucosa associated lymphoid tissue found?
-the pharynx
-small intestine
-the appendix
Human immunodeficiency virus (HIV) disables the immune system by:
destroying helper T cells
Which of the following has the highest oxygen pressure?
the alveoli
Which of the following has the highest carbon dioxide pressure?
the tissues of the body
Which of the following is the correct sequence of respiratory organs that the air passes through on its way to the alveoli?
pharynx, larynx, trachea, bronchi, bronchioles, alveoli
The alveoli are cleaned by:
macrophages
The respiratory membrane is
fused membranes of alveolar and capillary walls
During inspiration?
intrapulmonary pressure goes down; the volume of the lungs increases
Intrapulmonary pressure is the
pressure within the alveoli of the lungs
During inspiration, how does the air pressure within the lungs change?
increased lung volume causes a decrease in Ppul
The PO2 of the alveolar air is 104 mmHg. The blood entering the pulmonary capillaries has PO2 of 40 mmHg. As blood leaves the lungs, the blood PO2
has increased to 100mmHg
Fully oxygenated arterial blood enters a capillary bed, where is encounters high CO2, inducing a right shift of the hemoglobin dissociation curve. This results in:
decreased oxygen binding by hemoglobin
How does most CO2 travel in the bloodstream?
as bicarbonate(HCO3-)
In which location will hemoglobin have the weakest affinity for O2?
-blood leaving the systemic capillaries of the tissues
-blood in the systemic veins
What sets the basic rhythm of breathing rate and depth?
the ventral respiratory group
Tom begins running causing his arterial PCO2 to increase. What affect will this have on the rest of the body?
increased rate and depth of breathing
Where does chemical chemical digestion of food begin?
the mouth
Which of the following is most responsible for the absorption of nutrients?
the small intestine
What is the correct sequence as food moves through the GI tract?
stomach, pyloric valve, duodenum, jejunum, ileum
Chemical digestion reduces large complex molecules to simpler compounds by
catabolic reactions
The ingestion of a meal high in fat content would cause which of the following to occur?
bile would be released from the gallbladder to emulsify the fat in the duodenum
Which of the following is true of hydrochloric acid(HCl) in the stomach?
gastric HCl activates pepsin; HCl kills bacteria
