Worksheet: Metabolism and the Liver

In this worksheet, we will practice defining metabolism, and describing the metabolic functions of the liver.

Q1:

What waste product is formed during anaerobic respiration in humans?

  • ACarbon monoxide
  • BLactose
  • CSulfuric acid
  • DHydrochloric acid
  • ELactic acid

Q2:

Why is a period of intense exercise often followed by heavy breathing?

  • ATo increase the temperature of the body
  • BTo increase the heart rate
  • CTo remove oxygen from the bloodstream
  • DTo provide cells with energy
  • ETo replace the oxygen lost

Q3:

Which of the following best defines metabolism?

  • AMetabolism is how quickly a person can lose weight.
  • BMetabolism is how quickly the body digests a meal.
  • CMetabolism is the total energy input divided by the total energy output of an organism.
  • DMetabolism is the sum of the chemical reactions that occur in each cell of an organism.
  • EMetabolism is the sum of all the energy lost from an organism.

Q4:

Which metabolic reaction in plants uses light energy to produce glucose and oxygen?

  • ARespiration
  • BTranslocation
  • CTranspiration
  • DOsmosis
  • EPhotosynthesis

Q5:

What organ is organ X in the diagram?

  • AGall bladder
  • BLiver
  • CHeart
  • DPancreas
  • EStomach

Q6:

The lactic acid that builds up in the body after anaerobic respiration is transported to the liver.

What sugar does the liver convert the lactic acid into?

  • ASucrose
  • BFructose
  • CGlucose
  • DRibose

Q7:

Which of the following best describes what is meant by oxygen debt?

  • AAn oxygen debt is the amount of oxygen lost in a 24-hour period.
  • BAn oxygen debt is the amount of oxygen required after exercise to remove the lactic acid from the body.
  • CAn oxygen debt is the amount of oxygen taken in by the muscles during exercise.
  • DAn oxygen debt is the number of breaths taken during a period of intense exercise.

Q8:

Why is it important that lactic acid be removed from the body after exercise?

  • AIn high concentrations, lactic acid can build up in arteries and clog them.
  • BLactic acid is poisonous and can cause blood poisoning.
  • CLactic acid is toxic at high concentrations and can break down cell walls.
  • DLactic acid is toxic at high concentrations and can cause muscle pain.
  • EIn high concentrations, lactic acid can interact with stomach acid and lower the pH of the body.

Q9:

In some metabolic reactions, large molecules are broken down into smaller ones.

What biological reaction breaks down glucose in cells to release energy?

  • AAmmonification
  • BMitosis
  • CRespiration
  • DOsmosis
  • EPhotosynthesis

Which biological molecules in the body break down to form urea?

  • ALipids
  • BFats
  • CNucleic acids
  • DCarbohydrates
  • EAmino acids

Q10:

In some metabolic reactions, large molecules are made from smaller ones, as shown in the simple diagrams provided.

What monomer subunits join together to form starch in a metabolic reaction?

  • ASucrose
  • BGlucose
  • CGlycogen
  • DCellulose
  • EAmino acids

What monomer subunits join together to form a protein in a metabolic reaction?

  • ALipids
  • BGlucose
  • CAmino acids
  • DPeptin
  • ECellulose

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