human body systems1

7/28/2019 Human Body Systems1

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Section 351

Human Body Systems


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Human Body SystemsSection 351

This section describes human organ systems andexplains how the body maintains homeostasis.


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Organization of the Body

List the levels of organization in amulticellular organism, from smallest to

largest. Cells

Tissues

Organs

Organ systems


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Nervous systemCoordinates the bodys response to changes in its

internal and external environments

Skeletal systemStores mineral reserves and provides a site for

blood cell formation

Integumentarysystem Serves as a barrier against infection and injury

Endocrine system Eliminates wastes and maintains homeostasis

Lymphatic/Immune

systems Helps protect body from disease.

Muscular systemHelps produce voluntary movement, circulate

blood, and move food

Reproductivesystem Produces reproductive cells

Respiratory system Provides oxygen and removes carbon dioxide

Excretory system Eliminates wastes and maintains homeostasis

Circulatory systemBrings materials to cells, fights infection, and helps

to regulate body temperature

Digestive system Converts food so it can be used by cells


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What are four types of tissues found in thehuman body

The four types of tissues are

muscle tissue, epithelial tissue,

connective tissue,

nervous tissue


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The eye is an example of a (an) ____.

organ


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Circle the letter of the type of tissue thatcovers interior and exterior body surfaces.

epithelial


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What is a gland?

A gland is a structure that makes and

secretes a particular product such as saliva,

sweat, or milk.


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Circle the letter of the type of tissue thatconnects body parts.

connective


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Maintaining Homeostasis

The process of maintaining a controlled,stable internal environment is called

homeostasis


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The process in which a stimulus produces aresponse that opposes the original stimulus is

referred to as________.

feedback inhibition


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Fill in the missing labels in the diagram toshow how a thermostat uses feedbackinhibition to maintain a stable temperature in ahouse.


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Is the following sentence true or false?

The part of the brain that monitors and

controls body temperature is the

hypothalamus.

true


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What happens if nerve cells sense that thecore body temperature has dropped below

37C?

The hypothalamus produces chemicals that

signal cells throughout the body to speed up

their activities, which causes a gradual rise in

body temperature.


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What happens if the body temperature risestoo far above 37C?

The hypothalamus slows down cellular

activities, minimizing the production of heat.

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