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3 years ago

Why are protist considered the first eukaryotes?

1 answer:

5 0

Different organisms moved in and out (notably, bacteria moved into a taxonomic kingdom of their own). ... In this system there are three main branches or "domains" of life: Bacteria, Archaea (both prokaryotic) and Eukarya (the eukaryotes). Within the eukaryotic domain, the protists are no longer a single group.

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Each of the following phrases describes the structure, function, or regulation of either the hypothalamus, posterior pituitary,

juin [17]

Answer:

1) Hypothalmus: .D) Synthesizes some hormones that are released into blood vessels bound for another gland - G) Synthesizes oxytocin and ADH - H) Integrates nervous and endocrine systems.

2) Posterior Pituitary Gland: A) Releases oxytocin - F) Is an extension of the Hypothalmus

3) Anterior Pituitary Gland: B) Synthesizes and releases PRL - C) Synthesizes and releases TSH - E) Regulated by hormones released into portal blood vessels

Explanation:

The hypothalamus is the source of at least nine hormones that act stimulating on inhibiting other hormones secretion.

The first hypothalamic hormone discovered is the thyrotropin-releasing hormone, TRH, that stimulates the thyrotropin release by the hypophysis. Another important hormone is the gonadotrophin-releasing hormone, GnRH, that controls the release of gonadotrophic hormones, such as LH and FSH. The somatostatin hormone inhibits the release of somatotrophin hormone from the hypophysis. The oxytocin and the antidiuretic hormone are also secreted and released by the hypothalamus and collected by the posterior hypophysis from where they are then released again to the system.

The hypothalamus secretes hormones directly into capillaries forward to the anterior hypophysis. Oxytocin and antidiuretic hormone, instead, go to the posterior hypophysis through nerve fibers.

The hypophysis gland, also known as the pituitary gland, is located under the hypothalamus which controls the hypophysis. It is considered to be the master gland as it acts as a source of hormones that stimulates different organs. The hypophysis is conformed of three lobules: anterior, intermediate, and posterior.

The anterior lobule releases somatotrophin, prolactin, trophic hormones such as thyrotropin or TSH, ACTH, and gonadotrophins such as FSH and LH.

The posterior lobule collects and release the hormones secreted by the hypothalamus, such as oxytocin and ADH.

The hypophysis and the hypothalamus are both controlled by other parts of the nervous system.

4 0

3 years ago

WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!!!!

andrezito [222]

The four astronomical bodies would be milky way, universe, planets and stars ur welcome

8 0

4 years ago

265. The perimeter of a rectangle

LenaWriter [7]

Answer:

L = 17 m, W = 12 m

Explanation:

W = (L - 5) m

P = 2(L + W) = 58 m

Substitute W = L - 5 from the first equation into the second equation and get L:

2[L + (L - 5)] = 58

2(2L - 5) = 58

2L - 5 = 58/2 = 29

L = (29 + 5)/2 = 17

Then W = L - 5 = 17 - 5 = 12

8 0

3 years ago

If the temperature outside is a sweltering 41 degrees Celsius, how is a human's body likely to respond to maintain homeostasis?

IRISSAK [1]

I believe its C, because when the human body feels hot, it sweats (or transpires) to maintain homeostasis. 40 degrees C is very very hot temperature

5 0

3 years ago

Read 2 more answers

1 what does it mean when we say a muscle contracts involuntarily? describe one body function that is linked to an involuntary mu

Nataly [62]

An involuntarily muscle contracts when you don't mean to do it, or you do it without thinking. One body function is the lungs contracting so you can breathe. you don't think about it it just happens. Hope this helped.

7 0

4 years ago