The right answer is The first image (the left one).
An atrium is an upper cavity of the heart, delimited by a thin wall, receiving blood from the bloodstream. There are two in the human heart, they allow the passage of blood from the veins (cellars and lungs) to the ventricles (right and left).
In its upper part (near the entrance of the superior vena cava) is located the sinus node, microscopic structure from which the electrical impulse which ensures the contraction of the heart (especially atrium) ...
The depolarization of the action potential is conducted step by step in the cells of the right and left atria, accompanied by a contraction of the muscle fibers.
Answer: C. Oxygen delivery to muscle is increased when more carbon dioxide is produced by the muscle.
Explanation:
When someone is doing an exercise, for example, his heart rate increases. This increases the rate at which oxygen is carried from the blood to the muscles and carbon dioxide is moved from the muscles to the lungs, where it will be breathed out.
I would suggest Solar energy as renewable source of energy to the local government.
<u>Explanation:</u>
Sun is the ultimate source of energy and solar energy is most sustainable energy. This renewable resources are those which can be generated continuously in nature and are inexhaustible.
The solar cells are made of thin wafers of semi conductor materials from silicon and gallium. When the sun's radiation strike on them, the sun's energy is converted into electricity. A group of solar cells joined together in a solar panel can give out a large amount of solar energy to run a power plant.
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▹ Answer
<em>B. water cycle</em>
▹ Step-by-Step Explanation
Water is something that is dependent on amongst living things. Without the water cycle, there wouldn't be a source of water and living things wouldn't be able to survive.
Hope this helps!
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immunity<span> involves your bodies direct response to an unknown pathogen. This response is the production of antibodies specific to the antigen of a particular pathogen. ... Conversely, </span>passive immunity<span>is an </span>immune<span> response which involves antibodies obtained from outside the body</span>
