Homeostasis Flashcards
(34 cards)
is homeostasis dynamic or a static process? and why?
It is dynamic. It is constantly changing to have everything at equal/needed concentrations
What are the two levels of homeostasis?
Cellular Homeostasis and Extracellular Fluid Homeostasis
what is the relationship between ECF and cellular homeostasis?
ECF homeostasis is necessary for the cellular homeostasis. It relies on the components of ECF to be in its “happy” state so the cell can function properly.
What are the two levels of ECF homeostasis?
Local and Systemic Homeostasis
Role of local homeostasis?
- maintain constant ECF environment
- utilizes paracrine and autocrines
- mostly restricted to a tissue space
- maintains function of tissues
when we think about homeostasis are we thinking about ECF or cellular homeostasis?
ECF
Role of systemic homeostasis?
- involves the entire body
- uses the Nervous system and endocrine system
- maintains function of the heart and brain
Endocrine Systemic Homeostasis Summary
-hormone can target one or more places in the body
Nervous Systemic Homeostasis Summary
-nerve cell electrical signal releases a neurotransmitter that is in close proximity neuron or effector cell
Paracrine Local Homeostasis Summary
targets to cells in close proximity
Autorcrines Local Homeostasis Summary
it targets itself since it is acting on the same cell
If there is too much [ ] in the ECF where does it go
- to storage deposits
- a net loss through metabolism
- excretion from body (through lungs, GI tract, kidneys, skin, menstrual flow)
If there is not enough [ ] in the ECF where does it get more?
- it gets it through food, air and synthesis of the body
- but most likely storage deposits
What causes a stimulus to be stimulated?
-change in ECF composition ([ ] of something), body temperature, blood pressure
What is the threshold stimulus of reflect receptor?
- it determines the amplitude of normal range
- the min stimulus required to activate reflex receptor and helps determine the normal range
What is used only is NS reflexes
Afferent Pathway, meaning it is not endocrine
Why does the afferent pathway not work for endocrine?
Because the reflex center for endocrine is ON the integrating center, so it doesn’t have an efferent pathway because it doesn’t have to carry anything from the reflex receptors to integrating center because they are connected.
What is the integrating center?
-receives stimulus, analyzes the information and then generates a response
What is the efferent pathway?
It carries commands from integrating center to effectors
What are the integrating centers for ES
Endocrine gland
What are the integrating centers for NS
brain/spinal cord
What are the efferent pathway for ES
Hormones (travel via blood)
What are the efferent pathway for NS
motor neurons
What is the effector?
any cell affected by efferent pathway, meaning if there is a change in function in response to efferent pathway
