Explain the roles of the hormones GnRH, FSH, and LH, in the male and female reproductive systems
What will be an ideal response?
In both males and females, gonadotropin-releasing hormone (GnRH) is secreted by the hypothalamus
gland and acts on the pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing
hormone (LH) into the bloodstream. While these two hormones were named for their function in
females, they both exert effects on the male reproductive system as well. In females, the target of FSH
and LH is the ovary: FSH stimulates follicular growth and maturation, and LH triggers ovulation and
subsequent formation of the corpus luteum from the remaining follicle cells. In males, the target of the
two gonadotropins is the testis. FSH stimulates Sertoli cells to secrete a protein and other molecules
that are required for spermatogenesis, while LH stimulates the Leydig cells to secrete testosterone.
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A) direct sexual contact for transmission. B) immunocompromised hosts. C) transmission by insect vectors. D) two hosts to complete their life cycle and reproduce.
Meningitis
a. results when a virus or bacterium crosses the blood-brain barrier. b. is not usually fatal. c. results when cerebrospinal fluid seeps out of the meninges. d. occurs when white matter mixes with gray matter. e. includes all of these characteristics
An __________ is an enclosed coastal region where
seawater mixes with nutrient-rich fresh water from rivers and streams. Fill in the blank(s) with the appropriate word(s).
In addition to opposable thumbs, which is another feature of primates adapted to living in a arboreal environment?
a. claws b. short limbs c. small brains d. stereoscopic vision e. tough epidermal layer