JH+nervous+system+reading

pg. 17 Homeostasis is an internal environment for cells that usually varies only within certain limits. for example the body's temperature stays between 35.6 and 37.5 degrees when it is homeostatic this temperature is maintained through the process of sweating and shivering. many parts of the body help to make this system work. for example the digestive system takes nutrients for the body and the respiratory system exchanges gases with the environment. Pg. 83
 * 1) 2 What is homeostasis, and how is it maintained? give some examples that show how systems work together to maintain homeostasis.

the skin has several accessory organs (hair, nails, sweat glands, and sebaceous glands), and, therefore, it is sometimes referred to as the integumentary system. because even thought our external conditions may change we still have bodily mechanisms that help us respond to the outside conditions and limit the amount of internal change. negitive feed back tends to promote homeostasis Pg. 245
 * 1) 7 Explain why skin sometimes is referred to as the integumentary system.
 * 1) 11 why is homeostasis defined as the " relative constancy of the internal environment?" does negative feedback or positive feedback tend to promote homeostasis?

when the environment outside of the body is too cold the sensors in the muscles tell the brain that they need to start shivering in order to the muscles moving which heats up the body.
 * 1) 9 How does the muscular system help maintain homeostasis?

Pg. 271

Sensory neurons- takes nerve impulses form the sensory receptor to the CNS Interneurons - lies totally within the CNS, they receive nerve impulses from Sensory neurons and other interneurons. Motor neurons - takes the nerve impulses from the CNS to the effector. pg. 293
 * 1) 1 what are three functions of the nervous system?
 * The nervous system receives sensory input from sensory receptor in the skin and organs
 * The CNS performs integration - the CNS sums up the input it receives from all over the body
 * The CNS generates motor output - nerve impulses from the CNS go by way of the PNS to the muscles and glands.
 * 1) 2 What are the functions performed by the three types of neurons? describe the structure and functions of the three parts of the Nueron.

exteroceptors - are the sensory receptors that detect stimuli from outside the body interoceptors - receive stimuli from inside the body.
 * 1) 1 contrast exterocepters and interoceptors.
 * 1) 4 list the cutaneous receptors and type of stimulus each responds to.
 * Meissner corpuscles- fine touch
 * Merkel disks - fine touch
 * root hair plexus - fine touch
 * Pacinian corpuscles - pressure
 * Ruffini endings -pressure