Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?
A. Cytokines B.
B. Lysozymes C.
C. Perforin D.
D. Granzymes.
Cytokines.
Cytokines are chemicals released by one type of immune cell to directly activate another type of immune cell.
They are small proteins that act as messengers between cells and play a key role in regulating the immune response.
Choice B.
Lysozymes is not the correct answer because lysozymes are enzymes that break down bacterial cell walls and do not directly activate other immune cells.
Choice C.
Perforin is not the correct answer because perforin is a protein that forms pores in the membranes of target cells and does not directly activate other immune cells.
Choice D.
Granzymes is not the correct answer because granzymes are enzymes that enter target cells and trigger apoptosis (cell death) and do not directly activate other immune cells.
Therefore, the Correct Answer is A.
More Questions on TEAS 7
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Q #1: Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?
A. Menstruation
B. Oogenesis
C. Fertilization
D. Ovulation
Answer Explanation
Ovulation refers to the process through which ovarian follicle releases egg ready to be fertilized by male sperm cells.
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Q #2: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?
A. Cytokines B.
B. Lysozymes C.
C. Perforin D.
D. Granzymes.
Answer Explanation
Cytokines.
Cytokines are chemicals released by one type of immune cell to directly activate another type of immune cell.
They are small proteins that act as messengers between cells and play a key role in regulating the immune response.
Choice B.
Lysozymes is not the correct answer because lysozymes are enzymes that break down bacterial cell walls and do not directly activate other immune cells.
Choice C.
Perforin is not the correct answer because perforin is a protein that forms pores in the membranes of target cells and does not directly activate other immune cells.
Choice D.
Granzymes is not the correct answer because granzymes are enzymes that enter target cells and trigger apoptosis (cell death) and do not directly activate other immune cells.
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Q #3: Which of the following is a mass within the ovary that secretes hormones to maintain the uterine lining during pregnancy?
A. Corpus luteum
B. Umbilical cord
C. Oocyte
D. Oviduct
Answer Explanation
Corpus luteum is responsible for secreting progesterone hormone that maintain the uterine wall, which is conducive for a fetus to develop.
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Q #4: What controls whether an embryo will develop testes or ovaries?
A. Pituitary gland
B. Hypothalamus
C. Y chromosome
D. Presence or absence of estrogen
Answer Explanation
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Q #5: Which hypothalamic hormone contributes to the regulation of the male reproductive system?
A. Luteinizing hormone
B. Gonadotropin-releasing hormone
C. Follicle-stimulating hormone
D. Androgens
Answer Explanation
What are the hormones that regulate the male reproductive system?
Three hormones are the principle regulators of the male reproductive system: follicle-stimulating hormone (FSH) stimulates spermatogenesis; luteinizing hormone (LH) stimulates the production of testosterone; and testosterone stimulates the development of male secondary sex characteristics and spermatogenesis.
