Homeostasis+Homework+BH

pg. 17 give some examples that show howsystems work together to maintain homeostasis.
 * 1) 2 What is homeostasis, and how is it maintained?

homeostasis is an internal environment for cels usually varies only within certain limits. the ability to maintain a relative constancy of it's internal environment. The systems of the body help maintain homeostasis. they all work together. The digestive system takes in nutrients, and he respiratory system exchanges gas with the environment. The cardiovascular system distributes nutrients and oxygen to cells and picks up their waste. The waste of the cells i excreted by the urinary system." above all the nervous system and endocrine systems are most important because they coordinate the functions o the other systems.

Pg. 83


 * 1) 7 Explain why skin sometimes refered to as the integmenary system.

It is sometimes called this b/c it has several organs like hair, nails, sweat glands, and sebaceous glands.


 * 1) 11 why is homeostasis defined as the " relative constancy of the internal environment?" does negative feedback or positve feedback tend to promost homeostasis?

homeostasis is the ability for all the systems to work together and maintain a constant environment with in your body. things like blood gluclose, Ph levels, and body temp. typically flucuate during the day, but stay at a semi-constant level b/c of homeostasis. negative feedback tends to promote homeostasis. " it is the rimary homeostatic mechanism that keeps a variable such as the blood gluclose leve, close to a value, or set point." A negative feedback mechanism is present when the output of the system "dampens" the original stimulus.

Pg. 245

Muscles contract and provide heat for the internal organs and hel warm the body This helps the other systems, and promotes good function.
 * 1) 9 How does the muscular system help maintain homeostasis?

Pg. 271


 * 1) 1 what are three functions of the nervous system?


 * the system recieves sensory input from the sensory receptors located on the skin and other organs
 * the CNS (central nervous system) performs interation. --> " sums up the input it ercieves from all over."
 * CNS generates motor output- Nerve impulses from CNS go by way of the PNS to the muscles and glands.


 * 1) 2 What are the functions performed by hte three types of nuerons? describe the structure and functions of the three parts of the Nueron.

Sensory nuerons are structures that detect changes in the environment

internueron lies entireley with in CNS recieve input from sensory nuerons and also from other internuerons in the CNS.

effectors carry out our responses to the environmental changes whether internuerons or extroceptors

pg. 293


 * 1) 1 contrast extrococeperts and introceptors

ex. --> sensory receptors that detect stimuli from outside of the body, such as the senses.

intreceptors--> recieve stimuli from the inside of the body.


 * 1) 4 list the cutaneous receptors and type of stimulus each responds to.

free nerve endings merkel disks frause and bulbs root hair plexus meissner corpuscles pacinian corpuscles ruffiniendings

it goes in a cycle (top to bottom)--> each responds to the one in that order.