Unit 2 (Body Systems) Review

Which of the following examples includes only chemical changes that occur in the digestive process?

• absorption of nutrients by villi in the small intestines

• chewing and swallowing food

• recycling of water from dissolved food back into the body.

• reaction of saliva, stomach acid, bile, and pancreatic juices with food.

Tags

NGSS.MS-PS1-2

A series of physical and chemical changes occur during the process of digestion. Which of the following processes best describes a physical change that occurs during digestion?

• stomach acid breaks down proteins

• bile breaks down fat

• saliva breaking down large molecules into smaller molecules

• chewing food to break down large pieces so they can be swallowed

The table below describes some processes in which food is changed as it travels through the digestive system. Which of the processes describe only physical changes in the food particles?

• Processes 1, 2, 3, and 4

• Processes 1, 3, and 6

• Processes 2, 5, and 6

• Processes 1, 3, and 4

The human body has specialized organs called glands which collect and process substances from the blood. The concentrated substances are then secreted as hormones to regulate body processes. These specialized organs are part of which body system?

• Circulatory

• Endocrine

• Integumentary

• Nervous

Which organ system is responsible for transporting oxygen throughout the organism?

• Endocrine system

• Respiratory system

• Excretory system

• Circulatory system

Which step in the digestive process represents a chemical change in food?

• Storing of swallowed food in the stomach

• Churning of food, liquids, and digestive juices in the stomach

• Movement of food down the esophagus to the stomach

• Substances in the mouth and stomach breaking down fats and proteins

What is an example of a physical change that occurs during digestion?

• Digestive enzymes in the stomach break down proteins into amino acids.

• Saliva in the mouth converts starches into simple sugars.

• Pancreatic enzymes break down fats into fatty acids.

• Teeth grind and tear food into smaller pieces in the mouth.

Two body systems work together to help remove waste products from blood. What are these two systems?

• Circulatory and excretory

• Skeletal and digestive

• Circulatory and integumentary

• Muscular and excretory

The main function of the excretory system is to -

• produce enzymes to help digest food

• collect and remove waste products from the body

• prevent disease and fight infections

• carry oxygen and nutrients to the body’s cells

Ovaries produce and secrete hormones in addition to eggs. To what human body systems do ovaries belong?

• Integumentary and reproductive

• Excretory and muscular

• Endocrine and reproductive

• Nervous and digestive