Worksheet: Removing Waste

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

Q1:

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

  • AExcretion
  • BRespiration
  • CHomeostasis
  • DMitosis
  • EPositive feedback

Q2:

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.

Q3:

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.

Q4:

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

Q5:

Urea is formed by the breakdown of what substance(s) in the body?

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

Q6:

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.

Q7:

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

Q8:

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

  • AShedding skin
  • BSweating
  • CUrinating
  • DExhaling

Q9:

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

Q10:

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

Q11:

It is observed that lizards living in the desert excrete their nitrogenous waste in the form of uric acid, which is solid and water insoluble, while aquatic animals excrete their nitrogenous waste in the form of ammonia, which is water soluble. Which of the following could be a plausible reason for that difference in the form of nitrogenous waste excreted by both?

  • ABecause ammonia is lighter than uric acid and that prevents fish from sinking
  • BBecause lizards use uric acid to protect their eggs while they are washed away underwater
  • CBecause desert lizards conserve water in their bodies by converting ammonia to uric acid
  • DNone of the answers are correct.

Q12:

The sweat glands are important functional units of the skin. They play an important role in keeping the enzymes in our bodies working optimally. What can that role be?

  • ATemperature regulation
  • BProtection against microbes
  • CProduction of the fatty layer of the skin
  • DProduction of skin pigments

Q13:

Which of the following is not correct about the skin?

  • AThe skin has different types of sensory nerve endings to relay information about the surrounding environment to the brain.
  • BSebaceous glands are responsible for producing and maintaining the fatty layer which is present under the dermis.
  • CSweat glands are the excretory units of the skin.
  • DMelanin-producing cells are found at the base of the inner layer of the epidermis.

Q14:

Which of the following is not a function of human skin?

  • ARegulating body temperature
  • BResponding to various stimuli
  • CGetting rid of toxic substances by converting them into non-toxic materials
  • DProtecting the body

Q15:

Which of the following might take place if the erector muscle in the skin contracts?

  • AThe sebaceous gland will secrete less of the oily secretion.
  • BThe sweat gland will secrete more sweat.
  • CThe hair on the skin will stand up straight.
  • DThe hair on the skin will relax and lie down.

Q16:

Which of the following could result in blocking sweat pores?

  • AVasoconstriction of skin blood vessels
  • BWater evaporating from secreted sweat
  • CA high number of hair follicles per unit area
  • DAll answers are correct

Q17:

Sweating happens during hot days, exercise, and fever. What do you think is the common cause of sweating in these cases?

  • ASkin dehydration
  • BBody temperature regulation
  • CUrea excretion
  • DProtection against infection

Q18:

Which of the following is part of more than one organ system?

  • ABoth the liver and the lungs
  • BThe liver
  • CThe lungs
  • DBoth the liver and the lungs belong to only one organ system each.

Q19:

Which of the following structures of the skin is not confirmed to be involved in the regulation of body temperature?

  • ASweat glands
  • BSensory nerve endings
  • CBlood capillaries
  • DMelanin-producing cells

Q20:

Fennec foxes and rabbits rely on their long ears to dissipate body heat to the surrounding air. Unlike them, humans rely mainly on to cool their body temperature.

  • Aexpelling hot air from their lungs
  • Bexcreting warm urine from their bodies
  • Cdrinking cold water and eating cold food
  • Dsecreting a watery substance on the surface of their skin

Q21:

During food digestion, some gases are released as waste products. Which of the following is the excretory organ responsible for getting rid of these wastes?

  • AMouth
  • BSweat
  • CAnus
  • DNone of the answers are correct.

Q22:

Which of the following correctly differentiates between the main roles of urine and sweat in the human body?

  • ANitrogenous wastes and excess water are excreted in urine, while sweat is for regulating body temperature.
  • BUrine is for regulating body temperature, while nitrogenous wastes are excreted in sweat.
  • COnly nitrogenous wastes are excreted in urine, while all other kinds of wastes are excreted in sweat.
  • DUrine is for excreting nitrogenous wastes and minerals, while sweat is for excreting water and carbon dioxide.

Q23:

The following bar chart shows the percentage of water excreted through three organs from the body of a person in summer and winter. What are the organs represented by 1, 2, and 3?

  • A1: kidney, 2: skin, 3: lungs
  • B1: kidney, 2: lungs, 3: skin
  • C1: skin, 2: kidney, 3: lungs
  • D1: lungs, 2: kidney, 3: skin

Q24:

When the body temperature exceeds its normal range, blood is diverted to the skin in an attempt to lose excess heat through the skin and sweating. Which of the following would facilitate that?

  • AAlternation between dilation and constriction of blood vessels to produce peristalsis
  • BConstriction of the blood vessels in the skin
  • CDilation of the blood vessels in the skin
  • DNone of the answers are correct.

Q25:

Which of the following enhances the efficiency of sweat glands in regulating body temperature in terms of the rate of sweat secretion?

  • AA coiled secretory tubule of the sweat gland
  • BA straight secretory tubule of the sweat gland
  • CIncreasing the length of the non-secretory sweat ducts
  • DAll the answers are correct.

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