Excretory System Flashcards
What can excretion happen through?
Lungs, kidneys and sweat glands
What is the urinary system’s function?
To filter blood and remove liquid waste
Through which blood vessels does blood enter and leave the kidneys though?
Renal arteries and veins
What are ureters?
Muscular tubes that carry urine from the kidneys to the bladder
What is the bladder?
Pear-shaped organ that holds urine to allow for urination to be infrequent and voluntary
How does is the bladder emptied?
By the contraction of smooth muscles
What is the urethra?
Passageway through which urine leaves the body
How do kidneys remove the waste products from blood?
By producing urine
What is the biggest waste product in urine?
Urea
How is urea produced?
When cells use oxygen and amino acids to produce energy
What’s the difference between excretion and elimination?
Excretion is the removal of metabolic waster produced in the body
ex: urine, carbon dioxide, sweat
Elimination is the removal of indigestible material
ex: feces
What’s are the three accessory organs and what are their purposes?
Liver: filters blood from the digestive tract
Lungs: remove carbon dioxide when exalted
Skin: secretes sweat
What is urine a made up of?
Water (95%)
Urea and other waster (2.5%)
Miner,as
Substances that are in excess in blood
What shouldn’t urine contain?
Protein
Glucose
Fats
Blood cells
What happens when there are too little minerals?
- The kidneys secrete more water to increase the concentration of minerals
- More urine
