L2 & Chp 1: Homeostasis, Organ Systems Flashcards
Define Homeostasis, Negative & Positive feedback, List the functions of negative feedback.
Define Homeostasis:
the bodys tendency to balance and maintains its conditions
What does homeostasis do?
- Keeps conditions optimal for cells and enzymes
- Allows body to adapt to changes
From simple to complex order, what are the major levels of organization in the human organism?
Atomic, chemical, cellular, tissue, organ, organ system, organism level
What are the 4 organ systems we are covering this semester?
Integumentary, Skeletal, Muscular, Nervous
What is a set point?
Physiological value in which the normal range fluctuates
What is normal range, relating to set point?
Restricted set of values that is optimally healthy and stable
Define “Negative Feedback”
our bodies mechanism that reverses a deviation from the set point
What are the steps to negative feedback and what do they do?
- Stimulus
- sensor/receptor
monitors the physiological value - control (integrating) center
compares the value to normal range - effector
causes a change to reverse the situation, return value to normal range
Define “positive feedback”
intensifies a change in the bodies physiological condition rather than reversing it
What are the eleven organ systems in the body?
- Integumentary
- Skeletal
- Muscular
- Nervous
Endocrine
Cardiovascular
Lymphatic
Respiratory
Digestive
Urinary
Male/Female Reproductive system
What is the integumentary systems major components?
- encloses internal body structures
- site of many sensory receptors
HAIR, NAILS, SKIN
What is the skeletal systems major components?
- supports the body
- enables movement w/ muscular system
Cartilage, bones, joints
What is the muscular systems major components?
- enables movement w/ skeletal system
- helps maintain body temp
skeletal muscles, tendons
What is the nervous systems major components?
- detects and processes sensory info
- activates bodily responses
brain, spinal cord, peripheral nerves
What is the endocrine systems major components?
- secretes hormones
- regulates bodily processes
pituitary gland
thyroid gland
pancreas
adrenal glands
testes
