D3.3 Homeostasis Flashcards
True or false?
Organisms aim to maintain internal conditions within a preset range.
T
A feedback response acting against the change of a factor is called negative feedback.
T or F?
T
________ feedback mechanisms aim to keep conditions fluctuating within a preset range.
negative
Identify the best definition for the term homeostasis.
Regulation of internal conditions within a range
Identify which of the following is an example of negative feedback.
Beta cells of pancreatic islets release the hormone
insulin into the bloodstream when glucose is high in blood.
Early signs of diabetes are excessive urination and excessive thirst.
T or F?
T
Identify the role of pancreatic hormones.
Regulating blood glucose
Identify how the release of pancreatic hormones would change during fasting (a period of time where no food is consumed).
Insulin decreases, glucagon increases
Identify which of the following is one of the major symptoms of type 2 diabetes.
Increase secretion of insulin in blood
In cold environments, the body’s blood vessels _____ in order to conserve heat. This process is called ________.
contrict, vasoconstriction
___________ is the homeostatic mechanism by which the body maintains a stable internal temperature.
thermoregulation
Identify which of the following parts of the human body are involved with thermoregulation.
Hypothalamus, pituitary gland and thyroid gland
Identify how muscles contribute to thermoregulation.
shivering
Identify which of the following is a way in which the body can conserve heat in cold environments.
Rising hair on the skin
Osmoregulation is the regulation of _______ concentration.
osmotic
Identify the name of the process by which the components of the blood move out from the glomerulus to the Bowman’s capsule.
Ultrafiltration
Determine the effect of increased blood pressure on the filtration rate of the nephron.
Filtration rate increases
Explain why the filtrate in Bowman’s capsule of a healthy person does not contain any blood cells.
The pores of the capillaries in the glomerulus are smaller than the cells
True or false?
The descending limb of the loop of Henle is permeable to water.
True
The loop of Henle is a part of the _______ in the mammalian kidney.
nephron
Identify the factor that decreases the secretion of ADH.
Consumption of water
The collecting ducts _____ water based on the body’s hydration status.
reabsorb
During exercise blood _______ dilate, blood flow ________.
vessels, increases
Define homeostasis.
Homeostasis is the tendency of an organism to maintain a stable internal state.
