Fall Review 2019

All of the following represent physical (mechanical) change in matter in the digestive system except

• teeth breaking down food into smaller pieces in the mouth.

• muscles contracting to churn food in the stomach.

• absorption of water from wastes in the large intestine.

• enzymes in the mouth changing starch into sugar.

When a heart contracts, it -

• creates a vacuum in the blood vessels.

• exerts a force that pulls blood through the body.

• exerts a force that pushes blood through the body.

• exerts no force.

The largest human body organ which regulates temperature and serves as a barrier against harmful microorganisms belongs to the -

• Circulatory system.

• Nervous system.

• Digestive system.

• Integumentary system.

When a runner begins to breathe hard during a race, it is because -

• he wants to give his lungs time to rest.

• his body needs more liquid.

• his body has no more carbon dioxide available.

• his body needs more oxygen to continue to work effectively.

What begins the chemical breakdown of food molecules?

• Mouth

• Saliva

• Stomach Enzymes

• Teeth

Where in the digestive system do both chemical and mechanical digestion occur?

• Mouth

• Small Intestine

• Stomach

• Both Mouth and Stomach

Which of the following best describes how the skeletal and muscular systems work together?

• They send chemical messages through the body.

• They protect cells.

• They bring nutrients to cells.

• They move and hold you up.

The systems which rid your body of wastes are -

• Excretory, circulatory, respiratory & skeletal

• Circulatory, muscular, excretory & digestive

• Respiratory, reproductive, excretory & integumentary

• Digestive, excretory, integumentary & respiratory

In an organism, the brain directs the body how to respond to stimuli from the environment. In a cell, this function is performed by the –

• cell membrane.

• chloroplasts.

• mitochondria.

• nucleus.

What function in plant cells is comparable to an animal eating food?

• Chloroplasts absorbing solar energy for cellular activities.

• Nuclei directing cellular activity from information held in DNA.

• Vacuoles storing wastes, protecting the rest of the cell from contamination.

• Cell walls providing rigidity and support for the cell structure.