Human Organ Systems Book Back Questions 6th Science Lesson 13

6th Science Lesson 13

13] Human Organ Systems

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

The smallest bone in our body is present inside the ear. It is called Stapes. It is only 2.8 millimetres long (average length). The longest bone in the body is the thigh bond. (Femur)

A new born baby has more than 300 bones. As the baby grow, some bone are joined together, hence the skeleton of an adult has 206 bones.

Each lung has about 300 million air sacs or alveoli. Yawning helps us to take in more amount of O₂ and to give out CO₂.

Donate blood: Hospitals have blood banks where blood can be temporarily stores before it is given to the patients in need. Every healthy person over 18 years of age can donate blood. So that, it can be given to persons in need during emergencies of accidents or operations. Blood donation saves their life.

Brain is said to store as many as 100 million bits of information in a life time.

Take care of your sense organs: Do not read in very bright or very dim light and also in moving vehicle. Avoid exposing eyes to screens of television, computer, laptop and cell phone for a long time. Do not rub your eyes harshly. Wash your eyes gently with clean water, two or three times a day. Ears should be protected from hard blows. One should never try to prick ears with toothpicks or hairpins, which are dangerous practices because it may puncture the ear drum and cause ear infection. One should bath at least once a day to keep skin clean and fresh.

Why do we drink water? Our body contains about 70% water. Some parts have more water like the grey matter of the brain (about 85%) and some less, like fat cell (about 15%). We normally consume 1.5 to 3.5 litres of water every day in the form of food and water.

Choose the best answers:

1. Circulatory system transports these throughout the body

(a) Oxygen

(b) Nutrient

(c) Hormones

(d) All of these

2. Main organ of respiration in human body is

(a) Stomach

(b) Spleen

(c) Heart

(d) Lungs

3. Breakdown of food into smaller molecules in our body is known as

(a) Muscle contraction

(b) respiration

(c) Digestion

(d) Excretion

Fill in the blanks:

1. A group of organs together make up an ___________ system.

2. The part of the skeleton that protects the brain is ___________

3. The process by which the body removes waste is _____________

4. The _____________ is the largest sense organ in our body.

5. The endocrine glands produce chemical substances called ______________

State true or false. If false, correct the statement:

1. Blood is produced in the bone marrow.

2. All the waste products of the body are excreted through the circulatory system.

3. The other name of food pipe is alimentary canal.

4. Thin Tube like structures which are the component of circulatory system are called blood vessels.

5. The brain, the spinal cord and nerves form the nervous system.

Match the following:

1. Ear – cardiac muscle

2. Skeletal system – flat muscle

3. Diaphragm – sound

4. Heart – Air sacs

5. Lungs – protection of internal organs

Arrange in sequence:

1. Stomach 🡪 Large intestine 🡪 oesophagus 🡪 pharynx 🡪 mouth 🡪 small intestine 🡪 rectum 🡪 anus

2. Urethra 🡪 Ureter 🡪 urinary bladder 🡪 kidney

Complete the analogy:

1. Arteries: carry blood from the heart :: _______________: carry blood to the heart.

2. Lungs: respiratory system :: _________________: circulatory system

3. Enzymes: digestive glands :: _________________: endocrine glands

Answers:

Choose the best answers:

1. Oxygen, Nutrient and Hormones 2. Lungs 3. Digestive system

Fill in the blanks:

1. Organ 2. The Skull 3. Excretion 4. Skin 5. Hormones

Say True or False:

1. True

2. False

Correct Statement: All the waste products of the body are excreted through the excretory system.

3. True

4. False

Correct Statement: Thin like tube structures which are the components of the circulatory system are called as capillaries.

5. False

Correct Statement: The Brain, Spinal cord, the nerves and the sensory organ forms the nervous system.

Match the following:

1. Sound 2. Protection of internal organs 3. Flat muscle 4. Cardiac muscle 5. Air sacs

Arrange in sequence:

1. Mouth🡪Pharynx🡪Oesophagus🡪Stomach🡪Small intestine🡪Large intestine🡪Rectum🡪Anus

2. Kidney🡪Ureter🡪Urinary Bladder🡪Urethra

Complete the analogy:

1. Veins 2. Heart 3. Hormones