LE Unit 4.0 Body Systems I

What is the smallest unit of life?

• Atom

• Molecule

• Cell

• Tissue

Answer explanation

The smallest unit of life is a cell, which is the basic structural and functional unit of all living organisms.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which system is primarily responsible for transporting nutrients throughout the body?

• Digestive system

• Circulatory system

• Respiratory system

• Nervous system

Answer explanation

The circulatory system is primarily responsible for transporting nutrients throughout the body by using blood vessels to distribute oxygen, hormones, and nutrients to cells and remove waste products.

What is homeostasis?

• The process by which cells divide

• The maintenance of a stable internal environment

• The breakdown of food into nutrients

• The exchange of gases in the lungs

Answer explanation

Homeostasis is the maintenance of a stable internal environment, ensuring balance and optimal conditions for bodily functions.

Tags

NGSS.HS-LS1-3

NGSS.HS-LS2-5

Which of the following is an example of a negative feedback loop in the human body?

• Blood clotting

• Childbirth contractions

• Body temperature regulation

• Fruit ripening

Answer explanation

Body temperature regulation is an example of a negative feedback loop in the human body as it involves mechanisms to maintain a stable internal temperature by reversing any deviations from the set point.

Tags

NGSS.HS-LS1-3

The heart is part of which body system?

• Digestive system

• Circulatory system

• Endocrine system

• Immune system

Answer explanation

The heart is part of the circulatory system, which is responsible for pumping blood throughout the body.

Which organ is NOT part of the digestive system?

• Liver

• Stomach

• Heart

• Small intestine

Answer explanation

The heart is NOT part of the digestive system as it is part of the circulatory system responsible for pumping blood throughout the body.

How do the circulatory and respiratory systems work together?

• By digesting food and absorbing nutrients

• By moving the body and responding to the environment

• By transporting oxygen and removing carbon dioxide

• By sending signals throughout the body

Answer explanation

The circulatory system transports oxygen to cells and removes carbon dioxide, while the respiratory system provides the oxygen and eliminates the carbon dioxide, working together to maintain proper gas exchange.

Which is a function of the nervous system?

• To pump blood

• To digest food

• To control voluntary and involuntary actions

• To transport nutrients

Answer explanation

The function of the nervous system is to control voluntary and involuntary actions, making it the correct choice among the options provided.

What is the primary role of the respiratory system?

• To circulate nutrients

• To remove waste from the body

• To exchange gases in the body

• To control body temperature

Answer explanation

The primary role of the respiratory system is to exchange gases in the body, allowing for the intake of oxygen and removal of carbon dioxide through breathing.

The process of nutrients being absorbed into the bloodstream occurs primarily in the:

• Stomach

• Liver

• Small intestine

• Large intestine

Answer explanation

Nutrients are primarily absorbed into the bloodstream in the small intestine, where the majority of digestion and absorption take place.