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NeTakaya
3 years ago
15

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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Student provides an explanation for carbon dioxide fluctuations for different seasons of the year. ( 2 points)
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Carbon dioxide fluctuations occur for different seasons of the year due to the presence of plants in an area.

<h3>Why carbon dioxide fluctuations occur for different seasons of the year?</h3>

The carbon dioxide levels in the atmosphere moves up and down every year when plants use carbondioxide gas through the process of photosynthesis and respiration. Plants take up the carbondioxide gas in the spring and summer season and release it in fall and winter season. In this modern world, the level of carbon cycle is increasing because more carbon dioxide is emitted from burning fossil fuels and other human activities.

So we can conclude that carbon dioxide fluctuations occur for different seasons of the year due to the presence of plants in an area.

Learn more about season here: brainly.com/question/15734021

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4 0
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In Asia, human population growth and land development have fragmented forest habitats. Because of this fragmentation, tigers hav
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Isolation of the tigers´ populations will cause an increase in inbreeding events, meaning a significant reduction in genetic diversity in each population. The loss of genetic variability will cause a reduction in the fitness of individuals. The population's survival will be threatened, with high chances of getting extinct.

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.  

Download pdf
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