Answer:
A) Preoperational stage is the correct answer
Explanation:
Preoperational stage: It is a second of a cognitive development that starts at the age of around two.which children begin to talk and it last at the age of approximately seven.
The features of the preoperational stage are:
- children develop imagination.
- They develop a memory that helps them to know the difference in the past and future.
Calcium is an important element required for muscle contraction and bone integrity.
The answer should be atria. (singlular: atrium)
Since there's 4 heart chambers in human heart, there is the left atrium and the right atrium.
The common function of atria is to receive blood transported from the veins. Which will then be pumped into arteries after leaving the atrium and the ventricle, which is the lower chamber of heart. The right atrium receives blood from the vena cava, which is transported from all the body parts, except lungs, while the left atrium receives blood from the pulmonary veins, which transport blood from the lungs.
Below the atria, there's also valves. When they're open, they allow blood to leave the atria, and towards the ventricle. They tend to open when the blood has too much weight which will push them open.
Usually, atria is smaller than ventricle, as they're not the location for the muscles to pump the blood away from the heart.
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