Answer:
The ability of caffeine to inhibit adenosine receptors, plays a very important role in heightened alertness and sleeplessness.
Explanation:
"<em><u>Caffeine</u></em>" (<em>1,3,7-trimethylxanthine</em>) is an alkaloid obtained from plants. It has a chemical formula of C8H10N4O2.
Caffeine is generally <em>hydrophillic</em> but sufficiently <em>lipophilic</em> to pass through all biological membranes and readily cross the blood-brain barrier.
Therefore can bind with the adenosine receptors. Due to the blocking of adenosine inhibitory effects through its receptors held by paraxanthine and caffeine, it indirectly affects the release of <u>norepinephrine, dopamine, acetylcholine, serotonin, glutamate</u> e.t.c.
The release of the above-mentioned hormones have a great impact on the heightened alertness of the body, especially <em>dopamine</em> and <em>serotonin</em>.
Answer: lens; retina
In myopia<span>, close objects look clear but distant objects appear blurred. Hyperopia is the reverse of myopia. Here you can see distant objects clearly, but have difficulty focusing on objects that are near. People have myopia (nearsightedness) and hyperopia )farsightedness) because the distance between their lens and their retina is either too short or too long.</span>
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The nurse should inspect the perineum. After membrane rupture, the umbilical cord may have bulge into the vagina blocking the fetus from coming out. The perineum area should be checked to confirm that this has not happen. The checking should be done at regular interval until the baby comes out.
Answer:
Distal
Explanation:
A finger is distal to the wrist, which is distal to the elbow, which is distal to the shoulder.
