Answer: A.Caffeine
Explanation:
Caffeine works by blocking adenosine, a neurotransmitter that promotes sleep. This makes us feel more awake and alert. It's the most commonly used psychoactive substance and is found in many everyday items like coffee and medicines.
The actual mechanism of A) Caffeine is to block chemicals that inhibit or slow nerve activity in the brain. Caffeine functions as an adenosine antagonist, meaning it inhibits the adenosine receptors. Adenosine is a neurotransmitter that promotes sleep, so caffeine's effect reduces sleepiness and enhances alertness.
This mechanism allows caffeine to indirectly increase adrenergic activity (energy release), promoting a more energetic state. While caffeine is often associated with increased alertness and arousal, it's important to remember that it's acting primarily by blocking the inhibiting effect of certain chemicals on the brain nerve activity.
It's noteworthy that caffeine, as the world's most widely consumed psychoactive drug, is unregulated, found in everyday items like beverages and medicines, and generally not harmful in moderation.
#SPJ11
The experimental conditions are always kept the same.
The results of the experiment are always accurate.
The same results are expected each time the experiment is done.
Answer;
The same results are expected each time the experiment is done.
If an experiment exhibits reproducibility it means the same results are expected each time the experiment is done.
Explanation;
Reproducibility is the ability of other people to produce the same results from a given experiment under the same conditions, and without the influence of unanticipated factors.
Reproducibility is an important aspect of science, this is because it ensures transparency and gives us confidence in understanding exactly what is done.
b. hamstring
c. hip flexor
d. soleurs
Answer:
The answer is A: The nervous system uses electrical signals, while the endocrine system uses chemical messengers
Explanation: Your body uses electrical signals to move muscles and all types of things like that. The reason you can move your fingers on demand is because of your brain sending electrical signals. Now for pain your body uses chemical signals. Your brain sends out chemical signals letting you know that you are in pain in that specific area.
water
hemolymph
lymphocytes
Ans.
Mollusks are organisms of an invertebrate phylum mollusca. In these organisms, open circulatory system is present, in which a fluid-filled cavity (hemocoel) bathes different body organs to provide nutrients and oxygen.
Mollusks show a three-chambered, simple heart with two auricles and a single ventricle. The ventricle pumps hemolymph into the aorta, which is then transferred to the rest of the body organs.
Thus, the correct answer is option). 'hemolymph.'
The answer is Hemolymph.
a. They perform body functions by diffusion.
b. They have organs for specific functions.
c. Similar cells do not cooperate together.
The answer to this question is C