Answer:
B) the river itself is the digestive system, the water flowing is the muscular system pushing the canoe (food) towards the end of the river (anus).
Explanation:
Sugar, water, and other food molecules.
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:
I think its Artificial selection decreases the rate of natural selection and change within a population.
Explanation:
Hope this helps
Answer:
A. All lipids are insoluble in water.
Explanation:
Macro molecules are also called polymers, which are formed as a result of polymerization of molecules such as carbon, hydrogen and oxygen.
There are four types of macro molecules in the mammalian system which are
- lipids
- nucleic acid
- protein
- carbohydrates
Lipids are macro molecules that do not dissolve in water i.e. they are hydrophobic. they help in the formation of cell membranes and hormones in the body.