A stimulus, which in this case is the (a) suckling by young, reaches the (b) hypothalamus. This causes the release of the hormone (d) TRH by the hypothalamus. TRH is a hypothalamic hormone which triggers the release of prolactin (PRL) by the anterior pituitary.
Therefore, the release of TRH stimulates the PRL secretion from the (e) anterior pituitary. Once the PRL reaches the bloodstream, it targets the cells of the (f) mammary glands. As a response, the mammary glands (g) produce milk.
This response participates in a positive feedback loop, which maintains or even increases the response when suckling triggers the appropriate nerve impulses.
PRL is also under negative control by the hypothalamus. When no stimulus is present, (c) dopamine is released by the hypothalamus. This causes the suppression of PRL secretion and inhibits the response of milk production.
Carbohydrates and Lipids have cho.
Answer:
They can use the host cell to copy themselves and make viral proteins
Explanation:
Viruses are organisms that are incapable of replicating on their own without infecting a living host. They use the host's ability to transcribe, translate and replicate to replicate themselves and translate their genetic material into proteins. The infection cycle represents their reproductive cycle.
Viruses infect their host cell by initially binding to specific receptors on the host's cell membrane. Then, they enter the host cell and incorporate their genetic material into the host's genome. They, then, use the replicational ability of their host to produce many virions and make proteins.
I believe the answer is B. Homoiothermal