Animal Systems

According to this information, some organs of the gastrointestinal tract —

• fit in more than one organ system

• perform only one function at a time

• supply the body with platelets

• produce soluble vitamins

How is the circulatory system related to the digestive system?

• The brain stem controls the heart rate.
• Blood carries nutrients to body cells.
• Stomach muscles contract and expand.
• The pharynx is a passageway for air and food.

Homeostatic regulation of the body is made possible through coordination of all body systems. This coordination is achieved mainly by

• nervous and endocrine systems
• respiratory and reproductive systems
• skeletal and excretory systems
• circulatory and digestive systems

Pelicans prevent serious wing damage by entering the water in the manner shown above. Which two organ systems in the pelican work together the most to accomplish this maneuver?

• Circulatory and nervous systems

• Nervous and muscular systems

• Muscular and digestive systems

• Digestive and circulatory systems

Blood sugar levels are controlled in the body through the feedback mechanisms of which two body systems?

• Respiratory and digestive
• Immune and nervous
• Endocrine and nervous
• Muscular and skeletal

Overlapping circles can be used to show relationships. In this diagram, levels of organization within living things can be shown. If each circle is made from the smaller circles inside it, what does circle “D” stand for?

• organs

• cell

• tissues

• organ system

What would circle “C” be?

• organs

• cell

• tissues

• organ system

A negative feedback loop is essential in maintaining homeostasis. In negative feedback, any deviation from normal levels is resisted. Which of the following is not an example of negative feedback?

• Saliva production is increased when a person is hungry.
• Increased blood pressure causes blood vessels to dilate.
• Increased insulin is produced when blood sugar levels increase.
• Metabolic rate lowers when the body is deprived of food over a period of time.

These two systems interact to allow our bodies respond to the environment and to maintain homeostasis.  (Hint - they both send messages and one is fast, one is slow)

• nervous and endocrine
• nervous and digestive
• endocrine and excretory
• respiratory and digestive

The two body systems that work together to protect you from foreign pathogens are...

• Integumentary and immune
• Reproductive and muscular
• Endocrine and digestive
• Respiratory and circulatory