The portal has been deactivated. Please contact your portal admin.

Lesson Worksheet: Removing Waste Biology

In this worksheet, we will practice describing the processes by which waste products are removed from the human body.


Removing waste from the human body is a crucial part of the process of maintaining a constant internal environment. What scientific term is given to the maintenance of a constant internal environment?

  • AExcretion
  • BRespiration
  • CHomeostasis
  • DMitosis
  • EPositive feedback


Which of the following correctly describes the correlation between the rate of respiration and carbon dioxide concentration?

  • AThe more cells respire, the lower the CO2 concentration in the blood.
  • BThe more cells respire, the higher the CO2 concentration in the blood.
  • CThere is no correlation between the rate of respiration and the CO2 concentration in the blood.


What is the primary method for removing carbon dioxide from the human body?

  • AExcreting it in urine
  • BExcreting it in feces
  • CExhaling it from the lungs
  • DSecreting it from the skin


A buildup of carbon dioxide in the blood can lower the blood’s pH. Why is it important that carbon dioxide is removed from the body?

  • AA decrease in pH can cause blockages in arteries.
  • BA decrease in blood pH has no effect on the body.
  • CA decrease in pH can change the structure of oxygen in the red blood cells.
  • DA decrease in pH can affect enzyme activity.


Why must urea be removed from the body?

  • AIf urea remains in the body, it can inhibit cell division.
  • BIf urea is not removed, it can break down cell walls.
  • CIf too much urea builds up, it can be toxic.
  • DIf urea is not removed, it will be stored as fat.


What substance (or substances) is urea formed by the breakdown of?

  • AUrine
  • BGlucose
  • CRed blood cells
  • DWater
  • EAmino acids


What is the primary method for removing urea from the human body?

  • AExhaling it from the lungs
  • BSecreting it from the skin
  • CExcreting it in urine
  • DExcreting it in feces


Which of the following is not a method of removing water from the body?

  • AShedding skin
  • BSweating
  • CUrinating
  • DExhaling


Which of the following structures has an important role in decreasing body temperature when it exceeds the normal range?

  • AFatty cells
  • BErector muscles
  • CSebaceous glands
  • DSweat glands


Melanocytes are responsible for the production of melanin, which is normally found .

  • Aprotected in the fatty layer
  • Bclose to the surface of the epidermis
  • Cdeep in the dermis
  • Din the inner layer of the epidermis

This lesson includes 21 additional questions for subscribers.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.