Homeostasis Flashcards
(23 cards)
Homeostasis
Ensures that the body’s internal environment remains constant despite changes inside and outside the body
Homeostasis is a what state of equilibrium
The dynamic state of equilibrium
Negative Feedback
reverses a change in controlled conditions. E.G regulation of blood pressure
Positive Feedback
Tends to strenthen and reinforce a change in the body’s controlled conditions E.G normal child birth
parenchymal cells
If parenchymal cells accomplish the repair, tissue regeneration is possible, and a near-perfect reconstruction of the injured tissue may occur.
fibroblasts
if fibroblasts need to come in to repair the tissue, they synthesize materials that aggregate to form scar tissue, a process known as fibrosis.
fibroblasts
if fibroblasts need to come in to repair the tissue, they synthesize materials that aggregate to form scar tissue, a process known as fibrosis.
fibroblasts
if fibroblasts need to come in to repair the tissue, they synthesize materials that aggregate to form scar tissue, a process known as fibrosis.
The function of homeostasis of all body functions
The skin and hair provide barriers to protect all internal organs from damaging agents in the external environment; sweat glands and skin blood vessels help regulate body temperature, needed for proper functioning of other body parts
The function of homeostasis on the Skeletal system
The skin helps activate vitamin D, needed for proper absorption of dietary calcium and phosphorus to build and maintain bones
The function of homeostasis on the Muscular system
Through activation of vitamin D, the skin helps provide calcium ion , needed for muscle contraction; the skin also rids the body heat produced by muscular activity
The function of homeostasis on the Nervous system
Nerve endings in the skin and subcutaneous tissue provide input to the brain for touch, pressure, thermal and pain sensations
The function of homeostasis on the endocrine system
Keratinocytes in the skin help activate vitamin D, Initiating its conversion to calcitriol, and hormone that aids the absorption of dietary calcium and phosphorus
The function of homeostasis on the Cardiovascular system
Local chemical changes the dermis cause widening and narrowing of skin blood vessels, which helps adjust blood flow to the skin
The function of homeostasis on the Lympathetic system and immunity
The skin is the “first line of defense” in immunity, providing mechanical barriers and chemical secretions that discourage penetration and growth of microbes
The function of homeostasis on the Respiratory system
Hairs in the nose filter dust particles from inhaled air; stimulating of pain nerve endings in the skin may alter breathing rate
The function of homeostasis on the Digestive system
The skin helos activate vitamin D to become the hormone calcitrol, which promotes absorption of dietary calcium and phosphorus in the small intestine
The function of homeostasis on the Urinary system
Kidney cells receive partially activated vitamin D hormone from the skin and convert it to calcitriol; some waste products are excreted from the body in sweat, contributing to excretion by the urinary system
The function of homeostasis on the Reproductive systems
Nerve endings in the skin and subcutaneous tissue respond to stimuli, thereby contributing to sexual please, suckling of a baby stimulates nerve endings in the skin, leading to milk ejection, mammary glands (modified sweat glands) produce milk; the skin stretches during pregnancy as the fetus enlargens
Four principal routes of heat loss
- Radiation
- Conduction
- Convection
- Evaporation
What are the controlled conditions monitored by? (input)
Receptors
What do receptors do?
They send nerve impulses or chemical signals to the control centre
What does the control centre do? (output)
It recieves the input and provides nerve impulses or chemical signals
