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An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and killing pathogen s and tumor cells. It detects a wide variety of agents, from virus es to parasitic worm s, and needs to distinguish them from the
The human body is the entire structure of a humanorganism, and consists of a head, neck, torso, two arms and two legs. By the time the human reaches adulthood, the body consists of close to 100 trillioncells, the basic unit of life. These cells are organised biologically to eventually form the whole body.
Size, type and proportion
The average height of an adult male human (in developed countries) is about 1.7â€“1.8 m (5'7" to 5'11") tall and the adult female about 1.6â€“1.7 m (5'2" to 5'7") tall. This size is firstly determined by genes and secondly by diet. Body type and body composition are influenced by postnatal factors such as diet and exercise.
The organ systems of the body include the musculoskeletal system, cardiovascular system, digestive system, endocrine system, integumentary system, urinary system, lymphatic system, immune system, respiratory system, nervous system and reproductive system.
The cardiovascular system comprises the heart, veins, arteries and capillaries. The primary function of the heart is to circulate the blood, and through the blood, oxygen and vital minerals to the tissues and organs that comprise the body. The left side of the main organ (left ventricle and left atrium) is responsible for pumping blood to all parts of the body, while the right side (right ventricle and right atrium) pumps only to the lungs for re-oxygenation of the blood. The heart itself is divided into three layers called the endocardium, myocardium and epicardium, which vary in thickness and function.
The digestive system provides the body's means of processing food and transforming nutrients into energy. The digestive system consists of the - buccal cavity, esophagus, stomach, small intestine, large intestine ending in the rectum and anus. These parts together are called the alimentary canal (digestive tract).
The integumentary system is the largest organ system in the human body, and is responsible for protecting the body from most physical and environmental factors. The largest organ in the body, is the skin. The integument also includes appendages, primarily the sweat and sebaceous glands, hair, nails and arrectores pili (tiny muscles at the root of each hair that cause goose bumps).
The main function of the lymphatic system is to extract, transport and metabolise lymph, the fluid found in between cells. The lymphatic system is very similar to the circulatory system in terms of both its structure and its most basic function (to carry a body fluid).
An adult human has approximately 206 distinct bones:
- Spine and vertebral column (26)
- Cranium (8)
- Face (14)
- Hyoid bone, sternum and ribs (26)
- Upper extremities (70)
- Lower extremities (62)
The nervous system consists of cells that communicate information about an organism's surroundings and itself.
From Yahoo Answers
Answers:Circulatory system- to delivery oxygenated blood to the various cells and organ systems in your body so they can undergo cellular respiration Integumentary system (skin)- keeps the bad out and good in basically Endocrine system- to control growth, development, metabolism and reproduction through the production of secretion of hormones Respiratory system- to provide the body with a fresh supply of oxygen for cellular respiration and remove the waste product carbon dioxide Nervous system- to coordinate the body's response to changes in its internal and external enviroment Lymphatic (immune) system- to remove infections diseases and other pathogens from the human body Excretory system- to rid the body of wastes, including excess water and salts Muscular system- works with the skeletal and nervous system to produce movement, also helps to circulate blood through the human body Digestive system- to convert food particles into simpler macromolecules that can be absorbed into the bloodstream and used by the body Reproductive system- male and female, assist in reproduction Skeletal system- to provide structure and support to the human body
Answers:-response to stimuli would be the nervous system and endocrine system -ingestion would also be part of the digestive system -i'm not sure about growth but maybe the nervous + endocrine also?
Answers:try encyclopedia brittanica's website and search for anatomy videos.
Answers:1. Circulatory system Heart, veins, and I think the lungs count too. Its job is to circulate blood around the body so that there's oxygen. 2. Nervous system Brain, nerves, spinal chord. It sends signals from the brain to the rest of the body to do stuffs. 3. Skeletal system The bones. Provides structure so that our bodies aren't a squished up blob. 4. Muscular system The muscles. Muscles allow us to have movement. 5. Digestive system Esophagus, stomach, small intestine, large intestine, liver, gall bladder, mouth. It breaks down food and absorbs the nutrients. 6. Endocrine system The glands. Produces hormones to help regulate the body. 7. Immune system The skin, lymph nodes, white blood cells. Defends the body from germs, bacteria, etc. 8. Urinary system Kidneys, bladder, uterus. Produces urine, extracts waste. 9. Reproductive system. Ovaries, testes, and all those words middle school kids giggle at. It's for... making babies and passing on genes. 10. Respiratory system. Lungs, trachea, pharynx, larynx, diaphragm. It helps you breathe in air.