Multiple Choice
Where does the transfer of oxygen into the bloodstream primarily take place during gas exchange in humans?
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40. Circulatory System
Gas Exchange
Multiple Choice
CO\(_2\) enters and O\(_2\) escapes from a leaf via which of the following structures?
A
Stomata
B
Xylem vessels
C
Cuticle
D
Phloem tubes
Verified step by step guidance1
Understand the function of stomata: Stomata are small openings on the surface of leaves that allow for gas exchange. They facilitate the entry of CO\(_2\) for photosynthesis and the release of O\(_2\) as a byproduct.
Review the role of xylem vessels: Xylem vessels are specialized structures responsible for transporting water and minerals from the roots to the rest of the plant. They are not involved in gas exchange.
Examine the cuticle: The cuticle is a waxy layer covering the surface of leaves and stems. Its primary function is to prevent water loss, not to facilitate gas exchange.
Analyze the function of phloem tubes: Phloem tubes transport sugars and other organic compounds throughout the plant. They do not play a role in the exchange of gases like CO\(_2\) and O\(_2\).
Conclude that stomata are the correct structures for gas exchange, as they are specifically adapted to allow CO\(_2\) to enter and O\(_2\) to escape from the leaf.
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