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Transcript of Chapter 14
stress Umbrella Smallest unit of organization = cell
Cell -> Tissues -> Organs -> Organ Systems Four Types of tissue: Muscle Tissue: contracts and relaxes causing movement
Nervous tissue: directs and controls movement
Connective tissue: provides support to the body and connects all parts
Epithelial tissue: surfaces inside and outside your body is covered. Examples: Quadracep muscles
Skin Organs and Organ Systems Examples of Organs: Stomach, Heart, Brain and Lungs Perform Function more complex than those of tissues: The Heart:
Function- pump blood throughout the body
Consists of - 4 types of tissue: Muscle, nervous, connective and epithelial
Part of an organ system: Circulatory system, carries oxygen and other materials through the body. Homeostasis maintaining / in action Definition: "The process by which an organism's internal environment is kept stable in spite of changes from the external environment" Your body tries to maintain a regulatory temperature of approximately 37 degrees Actions by the body:
mind over matter-to avoid stress Skeletal System Key Concepts
What are the functions of the skeleton?
What role do joints play in the body?
What are the characteristics of bone?
marrow Five Major Functions of your Skeletal system Shape and Support
Produces blood cells
Stores minerals Vertebrae: 26 small bones located down the center of your back
analogy: Like a beaded necklace Joints:
Ball and Socket
attaches bone to bone Cartilage:
allows bones to rub against each other in joints Bone Structure Bones are complex living structures Compact Bone- dense and hard, but not strong. canals run through carrying blood vessels and nerves.
Spongy Bone- has many small spaces within it, lightweight but strong. Found at the ends of the bone.
Marrow- Two types: Red and Yellow Marrow stores fat for energy resource Bones contain:
Calcium Muscular System Types of Muscle: "There are about 600 muscles in your body" Involuntary Muscles and Voluntary muscles: Involuntary Muscles:
Not under our control
Muscles for breathing
Muscles for digesting food Three Types of Muscles Tendons- attach muscle to bone. Skeletal Muscle-Striated Muscle-Fast twitch muscles Smooth Muscle- found in stomach and blood vessels- involuntary The Skin Key Concepts
What are the functions and the structures of skin?
What habits can help keep your skin healthy?
cancer Muscles work in pairs: Functions of the Skin
Covers and Protects
Injury, infection, water loss
Regulates body temperature
Gauges environmental temperature
Produces vitamin D Epidermis Structure/Function:
Melanin- gives skin pigmentation
Dead cells provide cushion/protection- as in your fingertips Dermis:
Contains nerves and blood vessels
Contains sweat glands, hairs and oil glands
Pores allows for perspiration- sweat
Follicles- are hair like structures-helps monitor temperature
Oil- waterproofs the hair and keeps thetop layer of skin moist