Urinary System

In addition to water, the principal components of urine are

• amino acids and fatty acids
• urea and salts
• ammonia and bile
• hydrochloric acid and bases

Which structure is correctly paired with its function?

• urethra–eliminates urine from the bladder
• neuron–filters the blood
• ventricle–pumps blood directly into atria
• liver–produces intestinal amylase

After reabsorption in nephrons is completed, the fluid that is left in the tubules is transported to the

• Bowman's capsule
• circulatory system
• urinary bladder
• bile duct

The diagram represents a nephron. Which process takes place in region A?

• Proteins are converted to urea.
• Substances are filtered out of the glomerulus.
• Urine is stored temporarily.
• Water is reabsorbed into the blood.

The excretory system is responsible for moving toxic wastes, dissolved molecules, and excess heat. You would conclude that the excretory system contributes to

• circulating molecules around the body

• maintaining homeostasis in the body

• producing egg and sperm cells in the body

• gas exchange

Which sequence represents the correct pathway for the removal of urine from the human body?

• kidney → ureter → urinary bladder → urethra
• kidney → urethra → urinary bladder → ureter
• ureter → kidney → urinary bladder → urethra
• urethra → kidney → urinary bladder → ureter
  

In humans, the organ that most directly regulates the concentration of water in the blood is the

• heart
• liver
• pancreas
• kidney

In humans, the ureter transports urine from the

• blood to the kidney
• liver to the kidney
• kidney to the urinary bladder
• urinary bladder to outside the body
  

As urine is excreted, muscle contractions of the urinary bladder will cause the urine to pass into the

• ureter
• glomerulus
• urethra
• Bowman's capsule

What is the principal function of the excretory structure indicated by letter X in the diagram?

• reabsorption
• filtration
• storage
• egestion