Chapter 1 Quiz and Review

What is the main function of bones in the body?

• To help you breathe

• To make you taller

• To help you see

• To protect organs

Answer explanation

The main function of bones is to protect vital organs in the body, such as the heart and lungs, by providing a sturdy framework. This is crucial for overall health and safety.

What does the skull protect?

• The heart

• The stomach

• The lungs

• The brain

Answer explanation

The skull protects the brain, which is a vital organ responsible for controlling most functions of the body. Unlike the heart, stomach, or lungs, the brain is encased in the skull for protection against injury.

Which bone helps you chew food?

• Femur

• Rib

• Patella

• Jaw

Answer explanation

The jaw is the bone that helps you chew food. It consists of the upper and lower jaws, which move to grind and break down food, making it easier to swallow.

What does the rib cage protect?

• The legs

• The brain

• The heart and lungs

• The stomach

Answer explanation

The rib cage protects vital organs in the thoracic cavity, specifically the heart and lungs, from injury. It provides a bony structure that safeguards these essential organs during movement and impact.

What happens to muscles when they contract?

• They become longer

• They become shorter

• They become heavier

• They disappear

Answer explanation

When muscles contract, they shorten, pulling on bones to create movement. This is a fundamental property of muscle tissue, allowing for various physical activities.

What is an exoskeleton?

• A kind of medicine

• A type of muscle

• A hard outer covering

• A type of bone

Answer explanation

An exoskeleton is defined as a hard outer covering that provides support and protection to certain organisms, such as insects and crustaceans. This distinguishes it from muscles and bones, making 'a hard outer covering' the correct choice.

Which of the following is an example of a vertebrate?

• Worm

• Fish

• Insect

• Jellyfish

Answer explanation

A vertebrate is an animal with a backbone. Among the options, fish are vertebrates, while worms, insects, and jellyfish are invertebrates, lacking a backbone.

What are medicines used for?

• To make you run faster

• To improve your vision

• To treat illnesses

• To help you sleep

Answer explanation

Medicines are primarily used to treat illnesses by alleviating symptoms, curing diseases, or managing health conditions. While they can also help with sleep or vision, their main purpose is to address health issues.

What does it mean to prevent something?

• To forget about it

• To stop it from happening

• To ignore it

• To make it happen

Answer explanation

To prevent something means to stop it from happening. This definition clearly aligns with the correct answer choice, as it emphasizes the action of halting an event or situation before it occurs.

What are infectious diseases caused by?

• Germs

• Food

• Weather

• Exercise

Answer explanation

Infectious diseases are primarily caused by germs, which include bacteria, viruses, fungi, and parasites. While food, weather, and exercise can influence health, they do not directly cause infectious diseases like germs do.