SCIENCE 4-2ND QUARTER

1.     It is the largest and the most complex part of the nervous system.

• heart

• brain

• lungs

• liver

Answer explanation

Our brain is the control center for the body. As a part of the nervous system, the brain receives and makes sense of signals sent from nerve cells in the body. The brain also sends information to the body's muscles and organs.

2. 2. is a J-shaped, muscular, and hollow organ at the end of the esophagus.

• hands

• heart

• esophagus

• stomach

Answer explanation

Stomach can store two liters of food for about four hours on the average. Its main function is to secrete acids and enzymes for the digestion of food.

3. 3. This organ are hard, white tissues that form the skeleton.

• bones

• liver

• heart

• intestines

Answer explanation

A bone is a rigid organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the various other organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body, and enable mobility.

4. 4. How many bones do we have in the body?

• 304

• 206

• 526

• 181

Answer explanation

There are 206 bones in the human skeleton and these bones make up about fifteen percent of a person body weight.

5. 5. This organ is made up of elastic tissues that function primarily through contraction and working in pairs.

• muscles

• bones

• shoulders

• liver

Answer explanation

Muscle is defined as a tissue primarily composed of specialized cells/fibers which are capable of contracting in order to effect movement.

6. 6. It is the largest internal organ and is found just slightly below a human’s tunk.

• muscles

• bones

• liver

• lungs

Answer explanation

The liver is the largest internal organ in the body. It's about the size of a football. It sits mainly in the upper right portion of the stomach area, above the stomach.

7. 7. It is a tiny organ that is connected to the liver. Its function is to store the bile produced by the liver.

• large intestine

• ear

• teeth

• gallbladder

Answer explanation

The gallbladder stores and concentrates bile from the liver. The bile is then released into the first section of the small intestine (the duodenum), where it helps your body to break down and absorb fats from food.

8. 8. This organ breaks down food from the stomach and absorbs much of the nutrients from food.

• intestines

• gallbladder

• liver

• brain

Answer explanation

The small intestine is where many nutrients (like protein, carbohydrates, and fats) get absorbed into the bloodstream.

9. 9. What is the major organ of the respiratory system located at the center of the chest?

• liver

• intestines

• brain

• lungs

Answer explanation

Your lungs are on each side of your heart, inside your chest cavity. They are the main organs of the respiratory system. The right lung is divided into three lobes (sections), and the left lung is divided into two lobes.

10. 10. Is a hollow muscular organ that is about the size of a closed fist.

• heart

• liver

• brain

• lungs

Answer explanation

Your heart is a hollow muscular organ, about the size of your clenched fist. It pumps blood around the body, delivering oxygen to every organ and cell. The heart lies in the middle of your chest, just behind the breast bone.