Digestive System Quiz

What is the first stage of digestion in humans?

• Initial absorption

• Enzymatic breakdown

• Oral cavity (mouth)

• Gastric secretion

What is the role of the salivary glands?

• Produce enzymes for fat digestion

• Produce saliva which lubricates the food

• Secrete digestive hormones

• Facilitate nutrient absorption

What prevents food and liquid from entering the lungs during swallowing?

• Larynx contraction

• Tracheal closure

• Epiglottis

• Diaphragm elevation

What is the pH of gastric juice?

• Approximately 5.5

• Neutral (7)

• Approximately 8.5

• About 2

What are the three categories animals are classified into based on their nutrition?

• Detritivores, Scavengers, and Predators

• Herbivores, Carnivores, and Omnivores

• Frugivores, Insectivores, and Piscivores

• Granivores, Nectarivores, and Folivores

What are the four stages of food processing?

• Ingestion, Absorption, Secretion, Elimination

• Intake, Digestion, Absorption, Excretion

• Ingestion, Digestion, Absorption, Elimination

• Intake, Breakdown, Uptake, Excretion

What is the function of gills in aquatic animals?

• Extract dissolved oxygen from water

• Assist in buoyancy and movement

• Filter food particles from water

• Regulate body temperature

How do fish gills operate in terms of oxygen extraction?

• Diffusion gradient system

• Osmotic balance system

• Countercurrent exchange system

• Active transport system

What are tracheae in insects?

• Digestive tubes for nutrient absorption

• Sensory organs for detecting vibrations

• Branching tubes that transport air to tissues

• Protective exoskeleton structures

What is the role of the lungs in the respiratory system?

• Filter impurities from the blood

• Produce respiratory enzymes

• Regulate body temperature

• Intake of oxygen and release of carbon dioxide