Each hemoglobin molecule can transport up to ________ oxygen molecules.
5
4
2
6
3
The Correct Answer is B
A. 5: Hemoglobin molecules do not bind five oxygen molecules; this exceeds their structural capacity.
B. 4: Each hemoglobin molecule has four heme groups, and each heme can bind one oxygen molecule. Therefore, one hemoglobin molecule can carry a maximum of four oxygen molecules.
C. 2: Hemoglobin can carry more than two oxygen molecules; two would only represent half-saturation of the molecule.
D. 6: Six oxygen molecules exceed the binding capacity of hemoglobin and are not physiologically possible.
E. 3: Hemoglobin can bind three oxygen molecules, but this is not the maximum capacity. Four is the full complement when fully saturated.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Granzymes:Granzymes are proteolytic enzymes released by NK cells into target cells after perforin creates entry pores. They trigger apoptosis by activating caspases and degrading intracellular components, allowing NK cells to eliminate virus-infected or cancerous cells efficiently.
B. Selectins:Selectins are adhesion molecules that help leukocytes migrate during inflammation. They are not enzymes and are not secreted by NK cells, as their role involves cell-to-cell binding rather than inducing apoptosis.
C. Cytokines:Cytokines are signaling molecules used for communication within the immune system. Although NK cells secrete cytokines like IFN-γ, cytokines are not proteolytic enzymes and do not directly induce programmed cell death.
D. Interferons:Interferons are antiviral signaling proteins that enhance immune defense, but they are not proteolytic and do not mediate direct killing. NK cells may secrete interferons, yet these are regulatory rather than destructive molecules.
E. Perforins:Perforins create pores in the target cell membrane, enabling granzymes to enter. While essential to NK-cell function, perforins themselves are not proteolytic enzymes, but rather pore-forming proteins.
Correct Answer is ["prolactin"]
Explanation
The image illustrates the hypothalamic-pituitary-endocrine organ axis. Letter Apoints to the mammary gland (breast tissue), which is the target organ for milk production. The hormone at A is Prolactin (PRL). The hormone pathway originates from the pituitary gland. The line labeled Apoints directly to the mammary gland. The hormone responsible for stimulating milk production in the mammary glands is Prolactin (PRL), which is secreted by the anterior pituitary gland.
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