Page 29 - Future Stars Science Explorer-5

3. Cardiac muscles : These muscles are not attached to any bone. Our heart
is made of cardiac muscles. The muscles of the heart keep working 24 hours
a day, throughout our lifetime. Cardiac muscles are very strong and, hence,

they do not get tired.

Brainy Bites
Brainy Bites
Brainy Bites
• Femur is the longest bone and the sartorius is the longest muscle in the human body.

• Approximately 40% of our body weight is of muscles.

Research

Name the following :
1. The biggest muscle : _________________________________________________

2. The smallest muscle _________________________________________________
:
3. The longest muscle : _________________________________________________

Rapid
Review
Review
Review
— The organs which help to digest food, together form the digestive system.

— The bones of the skeleton are organized into a skeletal system.
— Twelve pair of ribs make a cage around the chest called the rib cage.

— The bones bend at the joints.
— All the muscles of our body form the muscular system.

Time to PractiSe

A. Tick ( ) the correct answer.

1. We have __________ bones inside our body.
a. 206 b. 308 c. 320

2. The __________ protects the delicate brain.

a. backbone b. rib cage c. skull

3. Our __________ are known as the forelimbs.
a. arms b. legs c. both of these

29 Science-5