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sergey [27]
3 years ago
5

Why do veins have valves

Biology
1 answer:
Dimas [21]3 years ago
4 0
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
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In rabbits, the allele for black fur, B, is dominant over the allele for brown fur, b.
zloy xaker [14]

Answer:its a 50% probably

Explanation: because the outcomes would be: BB, Bb, Bb, bb.

6 0
3 years ago
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In which horizons would plant be planted
hammer [34]
It is important to mention that "horizon" make reference to each layer that the soil has. Each of them has different characteristics which allow them to fulfill different roles. 
 If you want to plant the most appropriate horizon would be A. (A horizon) This is made up of mineral and decomposed matter and it presents a dark color. here many plats roots grown in.
6 0
3 years ago
why do you think the tide pool has a much higher oxygen content then the ocean at 6:00 pm and then a lower one at 6:00 am?
bagirrra123 [75]
The waves of a seashore hit the sand, because of the moon the tide lowers and rises. when it lowers the tide pool only has some water and a lot of oxygen when the tide rises it has less oxygen.

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3 years ago
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Which of the following departments would be included in a state governments public safety function​
Levart [38]
<h3><u>Full Question:</u></h3>

Which of the following departments would be included in a state government's public safety function?

A. Department of Education

B. Department of Emergency Management

C. Department of Environmental Protection

D. Department of Banking and Consumer Finance

<h3><u>Answer:</u></h3>

The department of Emergency Management should be added to the public safety function by the state government.

Option B

<h3><u>Explanation:</u></h3>

Public Safety function deals with those departments who are responsible for giving safety to the general citizens and curbing any sort of unexpected events that can disturb the natural environment of the state. Departments like department of police, emergency medicine are among these functions.

The department of emergency management is mainly supported by paramilitary or other trained personnel who are armed and have different tactics to curb the disturbances and nuisance being caused in the locality. It actually helps the normal citizens to live a safe and normal life. So this department should be added to the public safety function of the state.

8 0
3 years ago
Histamine increases blood flow and vascular permeability. This would account for all of the following changes that occur during
AnnZ [28]

Histamine inhibits the chemotaxis which is the movement of cells along the gradient.

Histamine:

It is a neurotransmitter that is released by the mast cells in response to an allergen that causes an allergic reaction. It is responsible for redness of the inflamed area, heating, movement of leukocytes, and defense proteins to the site of injury. Histamine is responsible for vasodilation and increased permeability. The immune cells move to the site of injury and cause the flow of blood to the injured site. It plays an important role in allergic and hypersensitivity reactions. Histamine is also responsible for gastric secretion, smooth muscle contraction, and itching.

Learn more about histamine here:

brainly.com/question/1217609

#SPJ4

6 0
2 years ago
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