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3 years ago

Neurons localized within the ________ control the secretion of acth.

Biology

1 answer:

Bumek [7]3 years ago

6 0

Excitation of HPA-Axis Stress Responses

Paraventricular nucleus corticotropin-releasing hormone (CRH) neurons are activated by neural inputs from a number of possible sources (Figure 1). Stressors signaling homeostatic challenge (commonly referred to as systemic stressors) are mediated by neurocircuits providing direct excitation of paraventricular nucleus (PVN) neurons. For example, HPA-axis activation by blood loss (hemorrhage) is mediated by activation of brainstem norepinephrine neurons that project directly to the PVN. Activation of the HPA axis by fluid imbalance appears to be triggered by angiotensinergic neurons of the subfornical organ, which sense increases in circulating angiotensin II. Negative energy balance signals are relayed to the PVN by the arcuate nucleus, which activates CRH neurons by release of excitatory peptide messengers (such as neuropeptide Y and agouti-related peptide). Responses to systemic stress are thought to be reflexive, that is, they do not require the engagement of cognitive processes.

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In the beginning all the contents were grouped together as one giant landmass. What role did separation of them play in evolutio

Lena [83]

When the continents separated, organisms were forced to be placed in different locations with different environmental conditions. In order to survive in their new environment, over time, various flora and fauna developed various body mechanisms to cope up. This brought up the speciation of flora and fauna.

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3 years ago

if heated water slowly bubbles up from underground, a has formed. A.well B.hot spring C.stream D.geyser

Ganezh [65]

Answer:

The correct answer is the option B. Hot spring

Explanation:

Hot springs are the spring of geothermally heated groundwater that is heated by the shallow intrusion of magma in volcanic areas. hot springs also are known as thermal spring which temperature is substantially high than the temperature of the surrounding area.

8 0

4 years ago

Read 2 more answers

If the DNA sequence is GCTCAATTCGACCTA, the complementary RNA

Elena-2011 [213]

Answer:

CGAGTTAAGCTGGAT

Explanation:

thymine pairs with adenine and guanine pairs with cytosine

T-A

G-C

7 0

3 years ago

An MLS student on her clinical rotation is running an immunofixation electrophoresis procedure on a 49 yo. male. She notes somet

GarryVolchara [31]

Answer:

1.)negatively charged protein

2.)positive anode

3.) shock

4.) ?

5.)decreased synthesis by the hepatocytes and water and sodium retention

Explanation:

1.Albumin is a negatively charged protein and its loss from the serum results in the retention of other negatively charged ions such as chloride and bicarbonate. As bicarbonate and chloride anions are used to calculate the anion gap, there is a subsequent decrease in the gap

2.At physiologic pH, most proteins are negatively charged, with albumin having a stronger negative charge and migrating further towards the positive anode, whereas immunoglobulins have the weakest negative charge and are closer to the negatively charged cathode.

3.?

4.?

5.Human serum albumin and liver cirrhosis

Patients with advanced cirrhosis almost always have hypoalbuminemia caused both by decreased synthesis by the hepatocytes and water and sodium retention that dilutes the

content of albumin in the extracellular space

#ihopethiscorrect.

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2 years ago

Scientists predict that we will eventually use up all available fossil fuels. Which list includes only fossil fuels?

motikmotik

Answer:

<u>B</u>:<em> natural gas, coal, and oil </em>

Explanation:

All fossil fuels are carbonated substances formed from organic matter comming from plants, microorganisms, and algae. This organic matter have been accumulating for millions of years in the bottom of seas or lakes and buried, fossilizeing. This fossilized matter is what gives origen to fossil fuels. They have an important, although not quietly considered, characteristic: They are non-renewable resources.

Coal is a fossil fuel that highly contributes to climatic change, polluting not only air but also water and the soil. By burning it, its gases contribute to increase the greenhouse effect and consequently producing global heat. This is affecting all forms of life that depend on these resources, including human beings. During the coal combustion process, several particles are released to air, polluting and being the cause of smog and acid rain. In spite of its reduced use in the last years, coal is still the principal fuel used by thermal, refineries, chemical, and still work industries.

Oil is also a huge contaminator and it generates a dangerous waste that is very harmful to the environment. Its elimination by incineration or split provokes huge pollution problems in the air, water, and ground. In water, it produces an impermeable film that impedes gas exchange and causes suffocation in the living forms that inhabit there. But if the oil is burned it generates nocive gases that are very toxic because of their content in plumb, chloride, phosphorus, sulfur, among others.

Natural gas is a hydrocarbure composed mostly of methane and other light hydrocarbures. As it is ussually found in deep underground depossits, the origen of natural gas is associated with petrolium, and hence they share many similar energetic properties.

5 0

3 years ago

Read 2 more answers