Homeostasis

Nervous and endocrine systems regulate body systems together

Nervous system controls all body activities, endocrine secretes hormones to regulate activity, supplying blood cells with needs and eliminating wastes.

Temperature, pH, and more is also regulated

Homeostasis is regulated by nervous and endocrine systems to maintain balance and stability despite external changes affecting internal environment

Negative feedback loops maintain homeostasis to counter stimulus (high body temp, a loops with bring it back down)

Vasoconstriction is when blood cells narrow to reduce heat loss and raise body temperature

Vasodilation is when blood cells expand to increase oxygen to body and sweating and lower body temperature

The hypothalamus is the part of the brain regulating homeostasis

Effectors are part of the body working to respond to a change (blood vessel dilation and constriction, shivering, muscle contractions, sweat glands, hormones releases)

Receptors are cells in sense organs that receive information thtat there has been a change and work to respond

The set body temperature is 37 C

Thermoreceptors in the skin sense temperature

A positive feedback loop increases the stimulus, moving away from homeostasis and amplifying effects

A state of balance (blood within accurate PH, good blood glucose, temperature)

Ectotherm is cold blooded, fluctuating body temperature with environment

Warm blooded is endotherm, using homeostasis and negative feedback to regulate body temperature

Vasodilation is done to cool the body

Vasocontraction is done to conserve body heat, keep you warn

Negative feedback is when a variable triggers a response to return to a balance, sometimes creating a negative feedback loop

Negative feedback is done with blood sugar and temperature regulation

Negative feedback with blood sugar: when glucose is too high, insulin is released; if too low, glucagon is released to release more glucose

Positive feedback intensifies the variable instead of counteracting it

With birth, the cervix is pressured, and the hormones involved with it causes contractions; more hormones release more contractions, making a positive feedback loop to birth the baby

With type 1 diabetes, the pancreas does not properly make insulin, not being able to create glucose and derailing the cellular respiration process (negative feedback didn’t work)