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.
Answer:
Option (c).
Explanation:
Classical conditioning may be defined as the type of learning in which the previous neutral stimulus combines with the potent stimulus and generates a strong response. This type of learning is associated with rewards or punishment.
Ivan Pavlov has explained the experiment of classical conditions on the dog.He measures the amount of saliva of dog and its behavior on ringing the bell for food. The dog has learned the behavior of classical conditioning on ringing the bell.
Thus, the correct answer is option (c).
Answer:
False.
Explanation:
A sprain is an injury to a ligament. When a sprain happens, one or more ligaments is stretched or torn. A strain is an injury to a muscle or tendon.
Answer:
Protein is mostly provided by plants because animal are dependent on plant for photosynthesis.
Explanation:
I believe the answer is (a) variability
