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Unit 10 Human Body Systems

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1 Unit 10 Human Body Systems
Searcy Ninth Grade Center  2012

2 Levels of Organization
The levels of organization in a multicellular organism include cells, tissues, organs, and organ systems. Organism Organ System Organs Tissues Cells Atoms

3 Cell Types and Tissue A cell is the basic unit of structure and function in living things. Specialized cells are uniquely suited to perform a specific function. Tissues are groups of cells that perform a specific function. Muscle Tissue: along the bones, enables body to move. Epithelial Tissue: glands and tissues that cover interior and exterior body surfaces. Connective Tissue: provides support for the body and connects its parts. Nervous Tissue: transmits nerve impulses throughout the body.

4 Cell Organization Each organ in your body, which are made of tissues, is part of an organ system, a group of organs that work together to perform a major function.

5 Nervous System Structures: Function: 1. Central Nervous System (CNS)
2. Brain 3. Spinal Cord 4. Peripheral Nervous System (PNS) Somatic-voluntary Autonomic-involuntary Function: Recognizes and coordinates the body’s response to changes in its internal and external environments.

6 Digestive System Structures: Function: Mouth Pharynx Esophagus Stomach
Small Intestine Large Intestine Liver Gall Bladder Rectum Function: Converts foods into simpler molecules that can be used by the cells of the body; absorbs food; eliminates waste.

7 Excretory System Structures: Function: Kidneys Ureters Urinary bladder
Skin Lungs Kidneys Ureters Urinary bladder Urethra Function: Eliminates waste products from the body in ways that maintain homeostasis.

8 Lymphatic/Immune System
Structures: White blood cells (T-cells) Thymus Spleen Lymph nodes Lymph vessels Function: Helps protect the body from disease; collects fluid lost from blood vessels and returns the fluid to the circulatory system.

9 Integumentary System Structures: Function: Skin Hair Nails
Sweat glands Oil glands Function: Serves as a barrier against infection and injury; helps to regulate body temperature; provides protection against ultraviolet radiation from the sun.

10 Skeletal System Structures: Function: Bones Cartilage Ligaments
Tendons Function: Supports the body; protects internal organs; allows movement; stores mineral reserves; provides a site for blood cell formation.

11 Muscular System Structures: Function: Skeletal muscle Cardiac muscle
Smooth muscle Function: Works with the skeletal system to produce voluntary movement; helps to circulate blood and move food through the digestive system.

12 Circulatory System Structures: Function: Heart Blood vessels Blood
Arteries Veins Capillaries Blood Function: Brings oxygen, nutrients, and hormones to cells; fights infection; removes cell wastes; helps to regulate body temperature.

13 Respiratory System Structures: Function: Nose Pharynx Larynx Trachea
Lungs Bronchi Bronchioles Alveoli Function: Provides oxygen needed for cellular respiration and removes excess carbon dioxide from the body.

14 Endocrine System Structures: Function: Hypothalamus Pituitary Thyroid
Parathyroids Adrenals Pancreas Ovaries (in females) Testes (in males) Function: Controls growth, development, and metabolism; maintains homeostasis.

15 Reproductive System Structures: Function:
Testes, epididymis, vas deferens, urethra and penis (in males). Ovaries, Fallopian tubes, uterus, and vagina (in females) Function: Produces reproductive cells; in females, nurtures and protects the developing embryo.

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