Chapter 35 Notes

The eleven organ systems of the human body work together to maintain homeostasis. These organ systems are:

• Nervous 
• Integumentary
• Respiratory 
• Digestive 
• Excretory
• Skeletal
• Muscular
• Circulatory
• Endocrine
• Reproductive
• Lymphatic

Different tissue types work together within organs. The types of tissue are

1. Muscle - most common in animals, controls the internal movement of materials such as blood. Also controls external movements like typing
2. Epithelial tissue - closely packed cells that cover the surface of the body and line internal organs such as the heart to prevent blood leakage. Glands are made of this type of tissue
3. Connective tissue - holds organs in place and binds different parts of the body together. An example would be a tendon
4. Nervous Tissue - receives messages from the body's external and internal environments, analyzes data and directs the response. 

Biological systems achieve homeostasis through feedback inhibition. 

The nervous system controls and coordinates functions throughout the body and responds to internal and external stimuli. 

The messages carried by the nervous system are electrical signals called impulses. The cells that transmit these impulses are called neurons. There are three types, motor, sensory and Inter neurons. 

A nerve impulse begins when a neuron is stimulated by another neuron or by its environment. 

There are five general categories of sensory receptors; pain receptors, thermo receptors, mechanorecpetors, chemoreceptros and photoreceptros.