AN I MMUNE RE­SPONSE

The process that pro­duces a fever be­gins when the im­mune sys­tem en­coun­ters a pathogen, such as a bac­terium or virus.

EQUUS - - Eq Tack & Gear -

1.

The horse is ex­posed to a dis­ease-caus­ing

or­gan­ism.

2.

As the im­mune sys­tem re­sponds, white blood

cells re­lease cy­tokines. 3. Cy­tokines stim­u­late in­flam­ma­tory re­sponses to fight

the in­fec­tion. 4. One type of cy­tokine, called a py­ro­gen, cir­cu­lates in the blood and is de­tected by the hy­po­thal­a­mus.

5.

The hy­po­thal­a­mus re­sponds by rais­ing the body’s

“set point” to a higher tem­per­a­ture and re­leas­ing neu­ro­hor­mones that cause the

body to heat up.

hy­po­thal­a­mus

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