Monday, April 20, 2009
Wednesday, April 1, 2009
Food must be changed into smaller nutrients before they can be absorbed into the blood and carried into the cells in the body.
- DIGESTION-Mechanical and chemical breakdown of foods for the use by the body's cells.
- ABSORPTION-Passage of digested food from the digestive tract into the cardiovascular system.
- ELIMINATION-The expulsion of undigested food or body waste.
Structures Of The Digestive System
The digestion process begins in the mouth,the first stage of the process, is taking the food into the body.
- TEETH-Primary function is to break the food you eat into smaller pieces.
- MASTICATION-Process of chewing.
- Salivary glands-Produce first juices in mouth.
- Tongue-Forms food to be swallowed.
When food is swallowed it enters the esophagus, it is a muscular tube about 10 inches long that connect the pharynx with the stomach.
- PERISTALSIS-a series of involuntary muscle contractions that move food through the digestive tract.
- GASTRIC JUICES-secretions from the stomach lining that contains hydrochloric acid and pepsin.
- CHYME-a creamy,fluid mixture of food and gastric juices.
CARE AND PROBLEMS OF THE DIGESTIVE SYSTEM
- Follow a well balanced diet that includes a variety of foods that are low in fat and high in fiber.
- Indigestion-is a feeling of discomfort in the upper abdomen.
- Heartburn-a burning sensation in the center chest.
- Hiatal hernia-a condition.
- Gas-carbohydrates or complex sugars cause gas.
- Constipation-condition in which feces become dry and hard and bowel movements become hard
Monday, March 23, 2009
Structure Of The Cardiovascular System
THE HEART-The heart and the brain are perhaps the most important organs in your body.Chambers Of The Heart-There are four chambers in the heart. Each of two smaller chambers is called an atrium. The two larger,lower chambers are called ventures.
Circulation In The Heart
Blood delivers oxygen,hormones,and nutrients to the cells and carriesaway wastes that the cell produce. About 55 percent of total blood.
are cells that prevent the body's loss of blood. They gather at the site of an injury and release chemicals.
Clear fluid that fills the spaces around body cells. It is transported by the lymphatic system to the heartand returns to the blood.
B-Cells And T Cells
B cells are lymphocytes that stimulate to multiply,T cells enlarge than multiply
Monday, March 2, 2009
The Skeletal System
The skeleton is a strong, flexible framework that supports the body and protects the infornal or glands.
Consist of 206 bone
AXIAL is made up of the bones of te head, neck, and trunk.
APPENDICULAR is made up of the bone sof the arms and legs and their supports
TYPES OF BONES
Long Bones are bones in your legs and arms.
Short Bones are almost equal in lenghts and width (wrists and ankles)
Flat Bones are somewaht thinner and much flatter than other bones, they are located inthe skull . The scapula or shoulder blade is an example of a flat bone
Irregular Bones are irregularly shaped bones such as some facial bones or verebrae
- Is a strong, flexible connective tissue it is another component of your skeletal system.
- Joints are points at which bones meet.
- Ball and socket joints are formed when the rounded head of one bone fits into the rounded cavity of an adjoining bone
- Pivot Joints allow limited rotation ot turning of the head.
CARING FOR YOUR SKELETAL SYSTEM
Caring for your skeletal system is important so your body will not get skeletal disorder.
FRACTURES is any type of break in a bone
Condition in which proggressive loss of bone tissue accurs
Lateral or side to side curvature of the spine
INJURIES TO JOINTS
Dislocation-results when the ligaments that attach the bone at the joint are torn
Torn cartlidge-can result from a sharp bow or the twisting of a joint.
REPETITIVE MOTION INJURY
This is damage to tissue caused by prolonged repeated movements such as sewing or computer work
THE MUSCULAR SYSTEM
TYPES OF MUSCLES-SMOOTH MUSCLES act on lining of passageways and internal organs. SKELETAL Muscles are attached to bone and cause body movements. FLEXOR is a muscle that close a joint. EXTENSOR is a muscle that opens a joint. CARDIAC MUSCLES is a type of straited muscle that forms the wall of the heart.
CARE OF THE MUSCLE SYSTEM
Regular physical activity is the best way to care for the muscular system. MUSCLE TONE is the natural tension in the fibers of a muscle.
PROMBLEMS OF THE MUSCULAR SYSTEM
Bruise-is an area of dislocated skin that appears after an injury causes the blood vessels beneath skin to rupture and leak
Muscle strain or sprain-results when a muscle is streched or partially torn as a results of overexertion
Tendonits-or the inflamtion of a tendon
Hernia-occurs when an organ or tissue protudes through an area of weak muscles.
MUSCLE DYSTROPHY is inherted disorde in which muscle fiber are destroyed.
THE NERVOUS SYSTEM
Neurons are nerve cells.
Cell body-contains the nucleous, the control center.
Dendrites-are branched structures that extend from the cell body in most neurons.
Axons-transmit impulses away from the cell body and toward another neuron, muscle cell, or gland.
Intergrates and controls the activities of your nervous system.
Second largest part of the brain