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The Human Body Systems working together Humans Have Systems For: Movement/Support/Protection Digestion Circulation Respiration Excretion (Waste Removal) Control and Coordination Reproduction Protection from disease These systems interact to keep an organism working properly and help maintain homeostasis Movement The skeletal system and muscular system work together so humans can move Why is movement important? escaping danger obtaining food and shelter reproduction The Skeletal System Also… Provides protection for the internal organs And… Inside of the bone is bone marrow which is where blood cells are produced Human Muscular System More About Muscles… There are different types of muscles Skeletal muscle is voluntary (under conscious control) and moves the bones Smooth muscle is involuntary (under unconscious control) and is found in places like the digestive tract and lines blood vessels Cardiac muscle is involuntary and is found in the heart Check Out The terminator’s muscular/skeletal system Digestion For the mechanical (chewing) and the chemical breakdown (enzymes) of food This is necessary so that food can be absorbed into the body and transported to all cells Mouth Salivary gland Esophagus Liver Gall bladder Stomach Pancreas Small intestine Large intestine Anus Circulatory System Moves substances to and from cells This system is necessary to supply needed materials to the cells and remove cell products and wastes Respiratory System For gas exchange Supplies oxygen to the body and removes carbon dioxide This system is necessary so that cells can use the oxygen to release the energy stored Excretory System Gets rid of all body waste products Removes excess heat energy This system is necessary because of the build up of waste products and poisons in the cells Don’t forget, these are also part of the excretory system! Control and coordination The nervous and endocrine systems interact to control and coordinate the body’s response to internal and external changes The response to stimuli The Nervous System The central nervous system (CNS) is your brain (central control) and spinal cord (links the brain to other parts of the body) Other nerves provide the pathways to muscles, glands and sense organs The Endocrine System • Regulates growth development and reproduction through glands • Glands produce hormones – chemical messengers that affect other parts of the body