Quiz Review: Forces, Energy T, and P/C Changes in the Human Body

What is a force?

• A mass or weight

• A push or pull

• A nucleus or an atom

• Joule

When the heart contracts, it exerts -

• exerts a force that pushes blood through the body

• exerts a force that pulls blood through the body

• exerts no force

• creates a vacuum in the blood vessels

All consumers, including humans, depend on plants for their energy needs. Plants use radiant or light energy to make foods that consumers eat. What type of energy is stored in foods as a result of this energy transformation?

• Heat energy

• Electrical energy

• Thermal energy

• Chemical energy

During digestion, which of the following energy conversions occurs?

• Electrical energy → chemical energy

• Mechanical energy → heat energy

• Chemical energy → heat energy

• Heat energy → chemical energy

A bird that eats seeds converts the energy stored in the seeds into the energy of its flight muscles. This conversion is from what kind of energy to what other kind of energy?

• Chemical energy → mechanical energy

• Radiant energy → chemical energy

• Sound energy → radiant energy

• Mechanical energy → thermal energy

Thermal energy is one of the forms of energy resulting from digestion which gets energy from food in the form of –

• Mechanical energy

• Radiant energy

• Light energy

• Chemical energy

Why is chemical digestion a form of chemical change?

• Because during chemical digestion, food is broken down into different substances

• Because during chemical digestion food is broken down into smaller pieces

• Because during chemical digestion food changes from a solid to a liquid

• Because during chemical digestion food loses energy

The diagram below represents the digestive system of a person who ate a turkey sandwich. In which organs will chemical digestion occur?

• 1 and 2

• 2 and 5

• 3 and 5

• 3 and 4

Which of the following is an example of a physical change in the digestive system?

• Enzymes breaking down carbohydrates into sugars.

• The stomach churning to break food into smaller pieces.

• Saliva changing starch into simpler sugars.

• Digestive juices breaking food into nutrients.

In digestion, evidence of a chemical change can be observed when –

• Pieces of food get smaller during chewing.

• Foods change shape in the stomach.

• Methane gas is produced in the intestines.

• Solid foods become liquid in the mouth.