Human Body Systems

The human heart is an organ that is made up of cells. Not all of the cells that make up the heart are identical, however. What name is given to a group of similar cells that perform a special function and together make up an organ?

• embryo

• organelle

• system

• tissue

Tags

NGSS.MS-LS1-3

What is the MAIN way the skin prevents pathogens from entering the body?

• by fighting them

• by acting as a barrier

• by creating immunity against them

• by triggering a response in the brain

Kidneys play a major role in the human excretory system by filtering what fluid?

• stomach acid

• urine

• blood

• bile

What's the body's biggest organ?

• brain

• heart

• liver

• skin

The body system seen here protects internal structures, provides support, and allows for movement. But this system does not work alone. In order for humans to move, this system must work together with the ___________ system.

• circulatory

• digestive

• muscular

• respiratory

When a blood vessel is damaged, platelets start to cling to the injured site and release chemicals that attract more platelets. The platelets continue to pile up and release chemicals until a clot is formed. This is an example of...

• neutral feedback

• positive feedback

• negative feedback

• oscillating feedback

Tags

NGSS.HS-LS1-3

The image shows how oxygen and carbon dioxide are exchanged between human beings and the environment. Which statement describes the image correctly?

• Carbon dioxide is inhaled into the lungs.

• Oxygen comes out of the capillaries of the lungs.

• Oxygen is picked up by red blood cells in the lungs.

• Carbon dioxide is absorbed by the blood cells in capillaries.

Tags

NGSS.MS-LS1-3

NGSS.MS-LS2-3

Which structures are found in the human female reproductive system?

• ovaries & uterus

• ovaries & testes

• prostate & uterus

• uterus & vas deferens

What is the process in reproduction where the male sperm unites with the female egg?

• digestion

• excretion

• fertilization

• gametization

Predict the next digestive system organ in the following sequence:

mouth, pharynx, esophagus, stomach, _______

• liver

• kidneys

• small intestine

• large intestine