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Fynjy0 [20]
3 years ago
13

The four pulmonary veins return oxygenated blood to this chamber. What is this chamber?

Biology
1 answer:
Semmy [17]3 years ago
3 0

Answer:

Left atrium

Explanation:

The four pulmonary veins return oxygenated blood to the left atrium.

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Which human characteristic is controlled by polygenic inheritance?
vladimir1956 [14]

Answer:

Human polygenic inheritance are height, skin color, eye color and weight.

Explanation:

Polygenic inheritance is the set responsible for many characters that appear simple from the surface. Many characters such as weight, shape, height, color, and metabolism are governed by the cumulative effect of many genes.

Polygenic inheritance is not expressed at all as discrete characters, as in the case of Mendelian characters. Instead, polygenic characters are recognized by being expressed as graduations of small differences (a continuous variation). The result forms a curve with an average value at the peak and extreme values ​​in both directions.

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What is the name of the beginning of a river?
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That would be called a source or head water 
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How do we get Proteins
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By eating things with protein in it. Sorry if this sounds too simple, but that's all it is.

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Some factories have started using large tanks of bacteria to remove carbon dioxide from the atmosphere. As more factories start
Softa [21]

Answer:

The carbon dioxide in the atmosphere will be reduced if more factories started using bacteria to capture carbon dioxide

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3 years ago
Acetylcholine receptors on skeletal muscles are described as being ionotropic receptors because
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Answer:

they are Na+, K+ and Ca2+ ion channels.

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Ionotropic acetylcholine receptors are also called nicotinic acetylcholine receptors because beside acetylcholine (Ch) they respond to nicotine. These receptors are  primary receptors in muscle for motor nerve-muscle communication that controls muscle contraction.

Two molecules of ACh are required for receptor to open. Since the receptors are  linked to ion channels, the channels open. Opening of the channel allows positively charged ions to move across it: sodium enters the cell and potassium exits.

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