D. Answer the following questions in brief.
1.
How many teeth are present in a four-month old child's mouth?
2.
Where is saliva produced?
3.
Define respiration.
4.
Name the flap that shuts off the wind pipe when you swallow food.
5.
How many types of vessels are found in the circulatory system of human beings?
6.
List down the main organs of the nervous system.
7.
Name the structure that protects the spinal cord.
8.
Name the process of fusion of an egg with a sperm.
Answers
Answer:
hey here is your ans
Explanation:
1.A child's mouth contains 20 initial teeth, called primary teeth, baby teeth, or deciduous teeth, consisting of the following teeth types: 4 second molars. 4 first molars. 4 cuspids (also called canine or eye teeth)
2.The major salivary glands are the largest and most important salivary glands. They produce most of the saliva in your mouth. There are three pairs of major salivary glands: the parotid glands, the submandibular glands, and the sublingual glands.
3.a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
5.There are five types of blood vessels: the arteries, which carry the blood away from the heart; the arterioles; the capillaries, where the exchange of water and chemicals between the blood and the tissues occurs; the venules; and the veins, which carry blood from the capillaries back towards the heart.
6.The nervous system has two main parts: The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
7.The spinal cord is protected by bones, discs, ligaments, and muscles. The spine is made of 33 bones called vertebrae. The spinal cord passes through a hole in the center (called the spinal canal) of each vertebra. Between the vertebrae there are discs that act as cushions, or shock absorbers for the spine.
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