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soldier1979 [14.2K]
4 years ago
5

Which choice is NOT part of the circulatory system?

Biology
1 answer:
ale4655 [162]4 years ago
5 0
The thyroid gland is not in the circulatory system

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Which of the following processes cycles matter through different parts of an ecosystem?
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Answer:

The nitrogen cycle, the water cycle and the carbon cycle

Explanation:

All of the above :)

Have a great one!

8 0
3 years ago
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A barrier that allows some substances in while keeping other
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C cause it let certain type particles to move threw
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In an ocean ecosystem, which is necessary to begin a food web?
artcher [175]

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phytoplankton production

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6 0
3 years ago
Which is the pair of the enzyme activities most significantly affected by glucagon- and insulin-dependent phosphorylation and de
prisoha [69]

Answer:

b. Phosphofructokinase;  Fructose-1,6-bisphosphatase

Explanation:

Glucagon is a hormone which functions to initiate gluconeogenesis whwreas insulin functions to initiate glycolysis.

Fructose-2,6-bisphosphate (F26BP) is an allosteric regulator of the <em>glycolytic and gluconeogenic enzymes phosphofructokinase-1 (PFK-1) and fructose-1,6-bisphosphatase (FBPase-1).</em>

It stimulates glycolysis and inhibits gluconeogenesis by binding to its allosteric site on phosphofructokinase-1 reducing its affinity for the allosteric inhibitors ATP and citrate .

It is formed by phosphorylation of fructose-6-phosphate catalyzed by  <em>phosphofructokinase-2</em> and is broken down by <em>fructose-2,6-bisphosphatase </em>which are two separate enzymatic activities of a single, bifunctional protein (PFK-2/FBPase-2).

Phosphorylation of PFK-2/FBPase-2 due to glucagon release enhances its FBPase-2 activity thereby stimulating gluconeogenesis and inhibiting glycolysis.

Dephosphsorylation of PFK-2/FBPase-2 due to insulin release enhances its PFK-2 activity, thereby stimulating glycolysis and inhibiting gluconeogenesis.

3 0
4 years ago
Which of the following glands does not secrete any hormones?
SCORPION-xisa [38]

The hypothalamus is the gland which produce no hormones.

<h3>What hypothalamus do?</h3>

The brain's hypothalamus is a section that lies immediately below the thalamus. Being the connecting link between the endocrine and neurological systems, despite its tiny size, this area is crucial for the healthy operation of the organism.

The hypothalamus does not secrete any hormones in this situation; instead, it controls hunger, thirst, blood pressure, and temperature.

For more information regarding hypothalamus, visit:

brainly.com/question/11352172

#SPJ1

4 0
2 years ago
Read 2 more answers
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