Figure 48-3 ​ ​

question 54

Multiple Choice

Figure 48-3 ​

​
Refer to the accompanying figure. Secretion of potassium and ammonium ions occurs mainly in the portion labeled as

• A) 2
• B) 5
• C) 7
• D) 9
• E) 10

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Definitions:

Valves

Structures in the heart and veins that maintain blood flow in a single direction, preventing backflow.

Pulmonary Capillaries

Pulmonary capillaries are the tiny blood vessels located in the lungs that surround the air sacs (alveoli), where the exchange of oxygen and carbon dioxide takes place between the bloodstream and the lungs.

Systemic Capillaries

The smallest blood vessels in the body's systemic circulation, where the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and the tissues occurs.

Superficial Palmar Arch

An arterial network in the palm of the hand that supplies blood to the fingers.