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alexandr1967 [171]
3 years ago
15

Blood flow is regulated in all three types of blood vessels through ____________ and dilation.

Biology
1 answer:
IrinaK [193]3 years ago
4 0

*Blood flow is regulated in all three types of blood vessels through constriction and dilation.

*Contraction of blood vessels slows blood flow, while relaxation of blood vessels, or dilation, allows free flow of blood.

*Muscle fibers control the constriction and dilation of vessels. In the capillaries, rings of muscle called capillary sphincters control blood flow.

*The directional flow of blood in the veins is controlled with valves , which prevent backward blood flow when closed, and allow blood to flow only toward the heart when open.

Vasoconstriction and vasodilatation allow blood vessels (arteries and veins) to control blood flow and thus control the blood pressure. This is possible because of the smooth muscle cells that surround the vessels. The contraction and dilatation of those muscles is controlled by chemical signals (e.g. norepinephrine constricts the vessels, while NO dilates them).

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Because they are not working together

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Which characteristic do all protists have?
myrzilka [38]

Answer: They all survive in any environment.

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I'll explain why the others aren't correct.

Protists can be both unicellular and multicellular, they're not always unicellular. Kingdom Protista contains all eukaryotics, so they're not always unicelluar.

Protist cannot make or consume food. Animals consume food, and plants make food, not protista. Yes they're many plant-like protists out there, such as algae, they get their food from the sun above. So all protists cannot make or consume food.

Protist does have flagella, but not all protists. Protists that are motile and generate movement have flagella, meaning they move. Not all protist move, like plants can't move. So, not all protists have flagella, meaning they can move.

Let me know if you have any questions.

<em>                                                                                            Sincerely, Lily :)</em>

6 0
3 years ago
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Which portions of the large intestine are located in the pelvic cavity?
Whitepunk [10]

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The sigmoid colon typically measures 25 to 40 cm in length (10 to 15.75 in). As a continuation of the descending colon, the sigmoid colon is a "S"-shaped section of the large intestine that starts in front of the pelvic brim and changes into the rectum at the level of the third sacral vertebrae.

<h3>The large intestine is it located in the pelvic cavity?</h3>

The urine bladder, the remainder of the large intestine (the bottom region), and the internal reproductive organs are all located in the pelvic cavity, which is the lower part.

<h3>Which digestive system organ is located in the pelvis?</h3>

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<h3>Where in the abdominal cavity is the big intestine?</h3>

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learn more about large intestine here

<u>brainly.com/question/3476947</u>

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3 0
1 year ago
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Tpy6a [65]

Answer:

A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. Others are abiotic, like space, temperature, altitude, and amount of sunlight available in an environment. Limiting factors are usually expressed as a lack of a particular resource. For example, if there are not enough prey animals in a forest to feed a large population of predators, then food becomes a limiting factor. Likewise, if there is not enough space in a pond for a large number of fish, then space becomes a limiting factor. There can be many different limiting factors at work in a single habitat, and the same limiting factors can affect the populations of both plant and animal species. Ultimately, limiting factors determine a habitat's carrying capacity, which is the maximum size of the population it can support.

Explanation:

https://www.nationalgeographic.org/topics/limiting-factors/?q=&page=1&per_page=25

7 0
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Kisachek [45]
In 1953, he developed a method to make strains of wheat highly resistant to a single form of rust.<span>
</span><span>

</span>
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