Answer:
contract
Electrical impulses from the brain tell the muscles to contract which moves the parts which causes pressure which squeezes the blood through the valves.
hope this helps xD
A type of learning in which a stimulus acquires the capacity to evoke a response that was originally evoked by another stimulus is known as classical conditioning.
In classical conditioning, a stimulus gains the ability to elicit a response that was first elicited by another stimulus. Almost by accident, Pavlov made this type of learning discovery while studying the canine digestive system.
He had surgically inserted a tube into a dog's salivary gland, which was used to collect the saliva the dog made after being given food powder to chew on. Before they were given food, several of Pavlov's dogs started to salivate.
To learn more about stimulus click here
brainly.com/question/20573834
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Answer:
The correct answer is: a triploid cell.
Explanation:
A triploid cell is the result of the fertilization of a diploid cell and a haploid cell. Triploid cells have 3 sets of chromosomes, diploids have 2 sets, and haploids have only 1 set.
Humans, besides many other species, have diploid cells - one set of chromosomes comes from the mother and the other set of chromosomes comes from the father. <u>In order to maintain this number, </u><u>gametes</u><u> (the sex cells: spermatozoids and oocytes) become haploid through meiosis</u>. This way, when the spermatozoid fertilizes the oocyte, the resulting cell will be diploid.
A gamete being diploid is a result of an <u>error during meiosis</u>, and will most likely generate a triploid cell during fertilization.
A triploid cell, unfortunately, <u>won't be able to survive,</u> so they are almost always spontaneously aborted in the first two weeks of pregnancy.
