DIGISTIVE SYSTEMMMM

Which example provides evidence for how the digestive system interacts with other body systems?

• The liver helps break down unwanted chemicals in the body.

• Food passes down the throat to the esophagus.

• The circulatory system transports the digested molecules throughout the body.

• Mechanical digestion and chemical digestion work together to break down the food.

The sentence below from the section "Changing Food To Fuel" helps to prove the claim that digestion is an involuntary process.

Chewing involves voluntary muscles — these are ones that we consciously control — but once

we swallow, digestion becomes involuntary.

Which sentence from the section provides further support for the claim?

• Our teeth start the process by chewing and grinding up each mouthful of food.

• The tongue works it into a ball-shaped mass, or bolus, for swallowing.

• Saliva uses specialized proteins called enzymes.

• It is sealed in the stomach by two ring like sphincter muscles for several hours.

At what point is digestion controlled by voluntary muscles?

• after you swallow

• in the mouth

• in the stomach

• when food reaches the small intestine

Read the following claim.

The digestive system is the series of tube-like organs that convert our meals into body fuel.

Which sentence from the article provides the BEST support for the above statement?

• Food on your plate must be converted into a mashed-up, gooey liquid for your digestive system to split it

  up into parts that your body can use: proteins, carbohydrates, fats, vitamins and minerals.

• These nutrients are taken into the bloodstream via millions of tiny fingerlike projections, called villi, and

  transported to the liver.

• It processes nutrients absorbed into the blood by the small intestine, creating energy-giving

  glycogen from carbohydrates.

• The liver also breaks down unwanted chemicals, such as alcohol, which is detoxified and passed from

  the body as waste.

Read the claim.

The body contains organ systems that interact with each other to carry out all necessary

functions for survival and growth.

Which statement provides evidence for the claim?

• The digestive system carries out all the functions necessary for an organism to grow and survive.

• The digestive system includes many organs such as the liver, gallbladder and pancreas.

• The digestive system breaks down and processes the food into usable molecules that provide energy

  and nutrients for the body.

• The digestive system works with the excretory system and circulatory system to process,

  provide, and remove the necessary and unnecessary nutrients to provide energy for bodily

  functions.

How does the pancreas affect digestion?

• It supports the small intestine in breaking down the chyme to extract useful nutrients.

• It produces enzymes that help the large intestine form waste into solid feces.

• It provides the stomach with enzymes like pepsin and lipase to break down proteins and fats.

• It connects the small intestine to the gallbladder to help dissolve fatty matter.

How is the liver the body's main chemical factory?

• The liver processes chemicals for many different functions within the body.

• The liver is where all of the food you eat is digested to produce energy.

• The liver is the organ where all of the nutrients are stored after the food you eat is digested.

• The liver controls all of the processes that occur within a living person or animal.

According to the article, WHY does the body produce saliva?

• to produce a bolus to enable swallowing

• to facilitate the chewing and grinding up of food

• to aid the esophagus in the transport of food through peristalsis

• to initiate the chemical breakdown of food in the mouth

when food reaches the small intestine

• A

• B

• C

• D