Answer:
A. epinephrine
Explanation:
Bronchial constriction usually involves the tightening of the smooth muscles which surrounds the tube-like bronchial airways. This occurs via extra mucus production, spasming of smooth muscles, or swelling/inflammation of layers within bronchi or bronchioles. Bronchial constriction typically results in symptoms of wheezing, coughing and shortness of breath.
This can be treated via the use of the hormone epinephrine, a bronchiodilator. For some cases like asthma, epinephrine in small aerosolized (inhaled) doses can lead to the <em>temporary</em> relief of symptoms. Epinephrine acts by making bronchial tubes wider to allow the passage of air.
In the body, smooth muscle cells in the veins, arteries and heart are under the control of epinephrine receptors called β2 receptors. Epinephrine binding to the receptor triggers a cell signalling cascade that activates β2 receptors to dilate smooth muscle in the lungs.
Here's how-
- Calcium is essential to mediating muscle cell signalling and thus contraction
- in the lungs, epinepherine-β2 receptor binding leads to enzyme activation (adenylyl cyclase)
- conversion of the energy molecule ATP to the secondary messenger molecule cyclic AMP.
- cAMP inhibits the activity of the enzyme <em>myosin light chain kinase </em>(MLCK) in smooth muscle
- ∴ the enzyme remains inactive and the muscles relax
<em>Summary:</em><em> epinephrine → muscle relaxation →</em><em> bronchial dilation (reduced diameter) </em><em>→ decreased respiratory distress → easier breathing.</em>
Answer:
I think if you change you can take certain pills to stop you from becoming a full man like hormone pills or something but I think everything still stays the same you could slightly change your voice like talk a different way and you could change your pitch and you could shave a lot so that you look more like a girl and could get plastic surgery but I don't think anything really changes other than which you make yourself change you could also try growing out your hair and making it really long but I mean if you're happy with the way you look now you should really change yourself
Explanation:
The answer to that is HPV
Overproduction of offspring in each species for many generations contributed to the presence of different ear sizes through natural selection.
<h3>What is Natural selection?</h3>
This is defined as the process through which populations of living organisms adapt and change.
The changes which occurred as a result of natural selection gave rise to presence of different ear sizes.
Read more about Natural selection here brainly.com/question/23929271