Question

q 1.8 blood entering the left atrium from the lungs is:
a deoxygenated and moving to the body
b oxygenated and moving to the body
c deoxygenated and moving to the lungs
d oxygenated and moving to the lungs

q 1.9 a patient has swollen lymph nodes during infection. this indicates that the lymphatic system is:
a producing hormones
b filtering pathogens and activating immune cells
c transporting oxygen
d breaking down food

q 1.10 damage to alveoli would most directly reduce:
a air intake
b gas exchange efficiency
c blood pressure
d muscle contraction

q 1.11 during inhalation, the diaphragm:
a relaxes and moves upward
b contracts and moves upward
c relaxes and moves downward
d contracts and moves downward

Explanation:

Analyze blood flow from the lungs to the left atrium

Blood returning from the lungs has just undergone gas exchange, making it oxygenated. It enters the left atrium via the pulmonary veins and is subsequently pumped by the left ventricle to the rest of the body. Thus, the blood is oxygenated and moving to the body.

Analyze lymphatic system function during infection

Swollen lymph nodes during an infection indicate that the lymphatic system is actively filtering out pathogens (like bacteria or viruses) and activating immune cells (such as lymphocytes) to fight the infection.

Analyze the effect of damage to alveoli

Alveoli are the tiny air sacs in the lungs where gas exchange (oxygen entering the blood and carbon dioxide leaving) occurs. Damage to these structures directly reduces gas exchange efficiency.

Analyze diaphragm movement during inhalation

During inhalation, the diaphragm contracts and moves downward, which increases the volume of the thoracic cavity and decreases pressure, allowing air to rush into the lungs.

Answer:

Question 1.8

• A Deoxygenated and moving to the body
• B Oxygenated and moving to the body (Correct answer)
• C Deoxygenated and moving to the lungs
• D Oxygenated and moving to the lungs

Question 1.9

• A Producing hormones
• B Filtering pathogens and activating immune cells (Correct answer)
• C Transporting oxygen
• D Breaking down food

Question 1.10

• A Air intake
• B Gas exchange efficiency (Correct answer)
• C Blood pressure
• D Muscle contraction

Question 1.11

• A Relaxes and moves upward
• B Contracts and moves upward
• C Relaxes and moves downward
• D Contracts and moves downward (Correct answer)