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Life Science

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Human Body Systems Digestive Circulatory Excretory Respiratory Muscular Nervous Skeletal Endocrine

Digestive SystemThe function of the digestive system is to berak down food into a form that can be used by the cells. The major part of the digestive system are: the mouth, the esophagus, the stomach, the small and large intestines, the liver and the pancreas.

Circulatory SystemThe function of the circularty system is to carry essential materials such as oxygen, food and hormones to cells and to remove wastes such as carbon dioxide and nitrogen wastes.The parts of the circulatory system are the heart, the blood vessels (arteries, veins and cappilaries), and blood.

Excretory SystemThe function of the excretory system is to maintain homeostasis of the body by removing wastes, controlling water balance and maintaining the ph of blood. the organs of the excretory system are the kidneys, the ureters, the urinary bladder, and the urethra.

Respiratory SystemThe function of the respiratory system is the exchange of oxygen and carbon dioxide between the atmosphere and the body's cells. The organs of the respiratory system are the lungs, the trachea, the heart, blood vessels. and blood.

Muscular SystemThere are three types of muscle, smooth, cardiac and striated. Smooth muscle lines the stomach, intestines, bladder and uterus.Smooth muscle is called involuntary because it is not consciously controlled. The heart and some arteries are made of cardiac muscle which is also involuntary. Skeletal muscles which are connected bones by tendons, are voluntary because they are consciously controlled.

Nervous SystemThe nervous system is made up of cells called neurons. These cells are responsible for the transmission of electral impulses that allow the body to respond to stimuli. There are two parts to the nervous system, (1) the central nervous system and the (2) peripheral nervous system.The central nervous system (CNS) is made up of the brain and the spinal cord. The peripheral nervous system is made up of motor neurons and sensory neurons. these neurons carry impulses to and from the CNS.

Endocrine SystemThe function of the endocrine system is to regulate the other systems through hormonal feedback mechanisms. It is the endocrine glands that produce hormones that are carried by the blood to the body cells. The pituitary gland, the thyroid gland, the adrenal glands, the ovaries and testes are endocrine glands.

CONCEPTUAL BIOLOGYPoster ProjectQuarter 3, 2010-2011Dr. Bonnet

Skeletal SystemThe skeketal system provides the frame of the human body. It provides attachments for muscles, levers for motion, protection of soft organs. In addition, blood cells are formed in the hollow centers of long bones, such as the thigh bone.

ReferenceBiggs, Alton, et. al., Glenco Biology, McGraw Hill/Glenco, 2007


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