Osmotic Regulation Ans Excrection Flashcards
___________regulates solute concentrations and balances the gain and loss of water
Osmoregulation
_____________, consisting only of some marine animals, are isoosmotic with their surroundings and do not regulate their osmolarity
Osmoconformers
______________ expend energy to control water uptake and loss in a hyperosmotic or hypoosmotic environment
Osmoregulators
Key function of the excretory system
Filtration: Filtering of body fluids
Reabsorption: Reclaiming
valuable solutes
Secretion: Adding nonessential
solutes and wastes from the
body fluids to the filtrate
Excretion: Processed filtrate
containing nitrogenous wastes,
released from the body
In the excretory system of the planarian, cilia of ______ ______propel waste through a tubule formed by a tube cell. Tubules are connected into branched structures that lead to pores located all along the sides of the body. The __________ is secreted through these pores.
Flame cells , filteration
annelids such as earthworms, _____________ filter fluid from the coelom, or body cavity. As the filtrate passes down the tubules, nutrients and other solutes are reabsorbed by capillaries. Filtered fluid containing nitrogenous and other wastes is stored in _________ and then secreted through a pore in the side of the body.
metanephridia, a bladder
smooth collapsible muscular sac located on pelvic floor; stores urine; holds 500 ml of urine.
Urinary bladder:
Thin walled muscular tube that drains urine from bladder and leads it out of the body; sphincters prevent urine flow until convenient
Urethra
slender tubes that convey urine from the kidney to the bladder
Ureters:
COMPOSITION OF URINE
- 95% water
- 5% solutes
a. mostly urea (from protein metabolism)
b. dissolved ions (Na+, K+) - Proteins, glucose or blood in urine indicate renal disease
- Drugs
The osmolarity of the urine is regulated by nervous and hormonal control._____________ makes the collecting duct epithelium more permeable to water
Antidiuretic hormone (ADH)
