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gavmur [86]
2 years ago
7

1. how many chambers does the human heart have?

Biology
1 answer:
cluponka [151]2 years ago
3 0
<h2>Answer:</h2><h3>1. four</h3>

Your heart has four separate chambers that pump blood, two on the right side and two on the left.

2. When the ventricle relaxes, the aortic valve closes <em>to prevent blood from flowing back into the ventricle</em>. When the aortic valve is not working properly, it can interfere with blood flow and cause the heart to strain to send blood to the rest of the body.

3. In medicine, a person's pulse is a pressure wave caused by the expansion of the arteries as a result of the circulation of blood pumped by the heart.

4. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them.

<em>hope</em><em> </em><em>this</em><em> </em><em>help</em><em>!</em><em> </em><em>^</em><em>^</em>

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Answer:

The start codon is AUG

Explanation:

A three nucleotide sequence (represented with bases) of a DNA or a RNA which translates to a specific amino acid is referred to as codon. To begin the translation into a new protein, the first three nucleotide is always AUG (called the START codon) which is the codon for methionine.

NOTE: AUG is the initial of the bases; Adenine, Uracil and Guanine

7 0
3 years ago
We see objects all around us because of which type of light
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Answer:

Reflected Light

Rays of light reflect, or bounce off objects around us.

4 0
3 years ago
What is so special about nitrogen in the atmosphere
HACTEHA [7]

Answer:

Firstly, the partial pressure of nitrogen (78%) is crucial to breathing purposes. Without this pressure, the lungs will burst and animals cannot survive.

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Thirdly, nitrogen and its derivatives act as greenhouse gases that maintain the Earth's temperature within a range that supports life. Yes, the increased abundance of nitrous oxides is not good because of acid rain and other issues, however, still, the presence of nitrogen is important for life on this planet.

5 0
3 years ago
to meet cellular needs for food,water,energy,waste removal,multicellular organisms have developed various specializations,such a
Dvinal [7]

Answer:

The correct answer will be- true and structural specializations

Explanation:

The evolution of life on earth has suggested that life has moved from the simplicity to complexity or from single-celled organism to multicellular organism.

This multi-cellularity is achieved through the property of called cellular differentiation and specialization. as the cellular complexity increases, therefore, cellular demands like the use of energy, food, water and other variables increased.

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Thus, true and structural specializations are the correct answer.

8 0
3 years ago
Read 2 more answers
Looking at the image of the freshwater lake ecosystem in the reading, can you name biotic and abiotic factors in this specific e
atroni [7]

Answer:

Biotic factors include: Fish (phytoplankton-eater, zooplankton-eater, predator)

, Crayfish

, Zooplankton

, Grasses, phytoplankton, herbivorous insect, worms, etc.

Abiotic factors include: Sunlight, Rainfall, Sedimentation, Weather, Minerals, Temperature.

Changes that would impact the biotic factors include:

Water, air pollution

Human activities: such as overfishing, rechanneling of the water for purposes such as irrigation, domestic or industrial use, or dredging of the bottom of the lake.

Explanation:

An ecosystem is composed of biotic and abiotic factors. Abiotic factors are non-living environmental factors such as water, air, soil, sunlight, and minerals. In aquatic ecosystems, abiotic factors include substrate type, water depth, nutrient levels, temperature, salinity, and waterflow. Biotic factors are the living organisms in the ecosystem and they include animals, birds, plants, fungi, etc.

In the image of the freshwater lake ecosystem given,

Biotic factors include: Fish (phytoplankton-eater, zooplankton-eater, predator)

, Crayfish

, Zooplankton

, Grasses, phytoplankton, herbivorous insect, worms.

Abiotic factors include: Sunlight, Rainfall, Sedimentation, Weather, Minerals, Temperature.

Changes that would impact the biotic factors include:

Pollution: pollution such as water pollution and air pollution will adversely impact the biotic factors.

Human activities: such as overfishing, rechanneling of the water for purposes such as irrigation, domestic or industrial use, or dredging of the bottom of the lake.

8 0
3 years ago
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