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Ilia_Sergeevich [38]
3 years ago
12

Nina studies an artificial heart model. The model has tubes that supply an electric current to the model. Nina switches on the c

urrent that provides an impulse to the heart. She observes that the heart contracts and relaxes. Compare this model with that of a human heart, and place the steps describing how blood flows through the human heart in order.
Biology
1 answer:
Eddi Din [679]3 years ago
8 0

Answer:

The human heart has it own nervous system, nodal system. It's made of nodes (that produces nerve impulses) and nerve fibers (running to all parts of the heart). Our nervous system can only increase or decreasing the nodes firing rates.

Starting with deoxygenated blood (oxygen poor blood), it travels from the superior and inferior vena cava into the right atrium, then into the right ventricle via the tricuspid value. There, it enters the pulmonary arteries via the pulmonic value. From there, it heads to the lungs and become oxygenated (rich in oxygen). It re-enters the left atrium of the heart via the pulmonary veins. There, it now travels to the left ventricle via the mitral valve and then into the aorta via the aortic value. From there it travels to the rest of the body supplying cells with oxygen and return back via the vena cava.

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Recombinant DNA (rDNA) _____.
Mazyrski [523]

Answer:

combines genes from organisms of different species in a lab

Explanation:

Recombinant DNA technology involves the process of joining the genes (DNA) of different multiple species in order to insert into another organism (host). Recombinant DNA technology has many applications in genetic engineering.

One example of Recombinant DNA is the synthesis of Insulin in bacteria cell where a human insulin gene is first inserted into a plasmid vector, then inserted into a bacterial cell that uses its expression abilities to transcribe and translate the gene into INSULIN protein.

This procedure is usually conducted in a laboratory with the use of certain laboratory equipments.

5 0
3 years ago
"Which sequence of organisms represents a food chain within this food web?
Delvig [45]
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4 0
3 years ago
Do stomata close when there is a lack of water in soil or a lack of carbon dioxide in the atmosphere?
Arte-miy333 [17]

<em>When water is abundant:</em>

-Temporal regulation of stomata is used:

Open during the day

Closed at night

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- Sunny day = demand for CO2 in leaf is high = stomata wide open.

- As there is plenty of water, plant trades water loss for photosynthesis products.

-  If the leaf's CO2 concentration is low, the stomata will stay open to continue fueling photosynthesis.

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5 0
4 years ago
Damian grew a plant from a leaf cutting. How did the plant reproduce?
ycow [4]
A plant grew from a leaf cutting will reproduce asexually.A plant cutting  refers to a piece of plant that is used to vegetatively propagate a plant. A plant cutting can be a piece of stem, root or leave. The plant cutting is usually placed inside a suitable medium, where the cutting will grow to produce a new plant under suitable conditions. Plants that are grown from plant cutting are considered to be reproduce asexually, because vegetative propagation is a form of asexual reproduction.

8 0
3 years ago
Read 2 more answers
How deep below Earth's surface do rocks melt?<br> A. 1000 km<br> B. 500 km <br> C. 50 km<br> D. 50 m
podryga [215]

Answer:

I say, it would really be around like 50-500km. Really, it would be 70km.

Explanation:

Magma rises with convective currents, then cools and spreads intent on form ocean-floor crust. The place to start for melting has lengthy been idea to be at <em>70 kilometers</em> under the seafloor.

6 0
3 years ago
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