Health-care workers are exposed to many different types of pathogenic microorganisms.
Which body systems work together to protect the body from pathogens?

Research has led scientists to conclude that fevers help the human body fight infection by elevating body temperatures and causing parts of the immune system to work better.
Which statement does this conclusion best support?

Which of the following functions at the same organization level as the kidney in the human excretory system?

Which of the following is the best example of an organism maintaining homeostasis?

A biology student is studying the digestive system. He found research indicating that more bacteria live in the large intestine than there are cells in the human body.
Based on this research, which of these can he logically conclude?

Which two body systems are involved in moving the person’s leg shown in the diagram below away from the table leg?

Hummingbirds need large amounts of energy to flap their wings between 60 and 200 times per second. Their wings beat so rapidly that it is difficult to see them move. They often appear suspended in air for extended periods of time without changing their location. Hummingbirds have long bills and grooved tongues to reach into flowers to feed on flower nectar. They also feed on insects.
The body system most directly interacting with the skeletal system to enable hummingbirds to beat their wings between 60 and 200 times per second is the--

The human body is composed of different systems made of specialized cells, tissues, and organs.Each of these structures has a specific function that aids in the survival of the human species.
Which organs are used in reproduction?

A wildlife biologist is investigating the sudden increase in the death rate among several bird species. She has not been able to determine what disease or toxin is causing the deaths, but she has found that many of the sick birds are exhibiting a shortage of dissolved oxygen and a buildup of dissolved carbon dioxide in their cells.
Which of these body systems in the sick birds is most likely functioning improperly?

Malaria is a disease caused by a microscopic parasite that attacks blood cells. The parasite is spread to humans through the bite of a mosquito. Malaria causes headaches, muscle pain, coughing, fever,and vomiting.
Why is malaria able to cause symptoms in so many parts of the body?

The diagram represents the relationship between two glands.
This is an example of--

Arteriosclerosis is a disease which clogs arteries in the human body. In arteriosclerosis, artery walls become thick. Fatty deposits built up on inner walls of arteries. This condition reduces the ability of arteries to perform their function. The diagram below shows a comparison between a healthy artery and one with arteriosclerosis.
Which body function is most affected by arteriosclerosis?

A person infected with the human immunodeficiency virus (HIV) may not have any symptoms for a period of time.
During this period the virus affects the body by doing which of the following?

The diagram below shows the locations of the pituitary glad and the kidneys in the human body.The pituitary gland can release a substance into the bloodstream that signals target cells in the kidneys to reabsorb more water.
The released substance is an example of--

Which of the following correctly describes an interaction that occurs between two body systems of a rabbit that helps the rabbit outrun a pursuing coyote?

The diagrams below illustrate different levels of organization in the human nervous system. An understanding of how the nervous system works at its various levels helps doctors explain normal body function and make proper diagnoses when patients are sick.
Which of the following would be the most likely effect of severe injury to the lower region of structure A?

Severe acute respiratory syndrome (SARS) is an illness caused by a corona virus. Symptoms including a high fever, headaches, and body aches typically occur two to seven days after infection by the virus. SARS is more serious in elderly patients.
This information suggests that the reproductive cycle of the SARS virus is—

What two human systems work together to provide body cells with a constant supply of oxygen while removing carbon dioxide waste products?

The diagram shows interactions between the nervous system and the endocrine system.
What happens immediately after the hypothalamus gland detects that there is not enough water in a person’s blood?

A student is giving an oral report describing how food moves down the esophagus in the process called peristalsis. She is using visual aids to illustrate the process. In her visual aids, she will shows interactions between two body systems.
Which two human body system will be shown in the visual aid?

When a person is suddenly cut by a sharp object, a nervous impulse is sent along a sensory neuron to the spinal cord. The impulse is immediately transmitted through motor neurons to produce a response.
Which of the following correctly identifies and describes this response?

The human digestive system is approximately 900 cm (30 feet) long.
Food is moved through the digestive tract primarily by —

A photograph of a virus is shown below.
The projections on the surface of this virus allow the virus to--

Cold sores are caused by the herpes simplex virus type 1.
A company that wants to develop antiviral drugs would ask a research immunologist to study--