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3 years ago

The process of decrease in any vessel diameter that occurs due to smooth muscle contraction is called:

Biology

2 answers:

scoray [572]3 years ago

6 0

Answer:

c. vasoconstriction

Explanation:

In condition of excess blood loss(haemorrhage) or exposure to very cold temperature, or drop in blood pressure, the process by which the smooth muscle cells of the walls of the artery and arteriole contract to increase the resistance of the vessels to reduce blood flow is called vasoconstriction.

The mechanisms, involve Increase stimuli from epinephrine and sympathetic nervous system which leads to increase in influx of Ca+ ions into the saccolemma reticulum of the smooth muscle cells.

Calcium-modulated -protein in the saccolema binds with Calcium. This results in a signal pathways , of calcium binding with tropin, tropomyosin exposure of myosin-binding sites,and formation of cross-bridges for sacomere shortening leading to contraction of smooth muscles for the narrowing of blood vessels.

Certain drugs called vasoconstrictors can also cause vasoconstriction of blood vessels. They are drugs prescribed for elevation of blood pressure.

quester [9]3 years ago

5 0

Answer:

c. vasoconstriction

Explanation:

Vasoconstriction is a process which involves the narrowing or tightening of blood vessels which becomes smaller when the smooth muscles of these vessels become contracted. The tightening or narrowing of the blood vessels results in an increase in resistance as blood pressure rises, which leads to the restriction of blood flow. Vasoconstriction is the opposite of vasodilation.

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The maxilla also frequently sustains fractures from blunt trauma to the face. which structures support and house the upper teeth

Leno4ka [110]

During a facial trauma due to facial injuries is generally sustained by maxillary bone. Maxilla is a combination of two bones and forms the upper jawbones. It supports the upper teeth while the mandible supports the lower teeth. Direct facial injury may cause maxillary injuries. The zygomatic bone protects the cheekbone and lies between orbital bone and maxilla.
The facial skeleton protects the facial bones and house the sense organs. The facial bone is complex MAXILLA house the upper teeth in the facial bone. It is thickened in an inferior concavity.

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3 years ago

What does the term "complementary" mean in base-pairing?

belka [17]

Answer:

From The School of Biomedical Sciences Wiki. Complementary base pairing is the phenomenon where in DNA guanine always hydrogen bonds to cytosine and adenine always binds to thymine. The bond between guanine and cytosine shares three hydrogen bonds compared to the A-T bond which always shares two hydrogen bonds.

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3 years ago

Read 2 more answers

IF most of the energy we use on earth comes from the sun –how does that energy (light and thermal) end up

____ [38]

Answer:

1: Chemical Energy

2: Kinetic Energy

3: Electrical Energy

4: Mechanical Energy

Explanation:

1: The energy held in food is called chemical energy. It is a form of potential energy held within chemical bonds between atoms.

2: When flowing water is captured and turned into electricity, it is called hydroelectric power or hydropower. There are several types of hydroelectric facilities; they are all powered by the kinetic energy of flowing water as it moves downstream.

3: The power for lights and stuff is Electrical Energy, ofc :]

4: The chemical energy in the food gets changed into the mechanical energy of moving muscles.

Hope this helps!! :D

5 0

3 years ago

What are possible negative effects of building a hydropower dam? Select the two correct answers.

MrMuchimi

The correct answers are B; Displacement of people living near the proposed dam and C; Lower river water levels in other areas.

Further Explanation:

The hydropower dam uses water instead of coal to generate electricity. Since they are build on the water, they will be using that source as a way to generate electricity. This will cause the water levels to be lower in some areas along the river.

When building a dam, they will need to use property that is located on the river. Many people own homes along the river banks all over the world. The company who will be building the dam will usually buy out the property owners at a fair market price. This will mean that they will have to move and leave their homes. The homes are typically torn down to make way for the dam.

In some instances, the water bills for the people in the area may be raised also since so much water is being used by the hydropower dam.

Learn more about a hydropower dam at brainly.com/question/5497101

#LearnwithBrainly

8 0

3 years ago

the chemicals in cigarette smokers are known to cause cancer propose a series of steps that could lead to the development of lun

Aleks [24]

Answer:

Cell deterioration

Explanation:

Once the cells first come in contact, they immediately create a cell shield that is composed of weaker cells, while the rest continue their work, the problem with this, is that their is a lack of cells to do work and the weaker cells are slowly dying and creating holes for the harmful chemicals to enter, as the cells deteriorate they clot together and create a lump in a final attempt, and it ends up creating deadly weight in the lungs.

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3 years ago