Through digestion, nucleic acids are broken down into
The epiglottis is a
Flap of cartilage that flips down to cover the entry to the trachea during swallowing
The mucous producing cells that line the stomach
Lubricate and protect the stomach lining
During which of the following stages of food processing is undigested material removed from the digestive tract?
Through digestion, polysaccharides are broken down into
Digestion begins in the
Smooth muscle propels food through the alimentary canal by a process called
The tongue does all of the following except:
An animal digestive tract that consists of two openings is called
The alimentary canal
The structure of the esophagus fits its function in that
It has smooth muscle for peristalsis
The digestion of carbohydrates begins in the mouth. What is the name given to the starch digesting enzyme secreted by salivary glands?
Human saliva performs all of the following functions except:
What happens to nutrient macromolecules in an animal's digestive tract?
Nutrient macromolecules are digested into monomers for absorption
Digestion is the
Chemical and mechanical breakdown of food for absorption into the body
Which of the following correctly lists the order of the parts of the human digestive system, from first to last contact, with food matter?
Oral cavity, pharynx, esophagus, small intestine, large intestine
Absorption of water is a major function of the
Bile produced in the liver is stored in the ________ before entering the intestine
Release of digestive enzymes by the pancreas
Release and storage of bile
Which of the following statements regarding animal digestive systems is false?
Meat is more difficult to digest than vegetable matter because of its protein content
The secretory parietal cells of the stomach are responsible for producing
Nutrients absorbed by the intestines move directly to the liver, which
Converts excess glucose to glycogen
The stomach mixes food with secretions of the stomach wall to form
Which of the following is important in the digestion of lipids?
In the digestive system, most nutrient absorption occurs in the
The function of the pyloric sphincter is to
Periodically release chyme into the duodenum in periodic squirts
Release of chyme in the duodenum
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percent of this water gets reabsorbed?
Which of the following mechanisms helps prevent the gastric juice from destroying the stomach lining
Generation through mitosis of new cells to replace the stomach lining
Which of the following nutrients is digested only after it reaches the small intestine?
Urine flows from collecting duct into
The overall process that refines the filtrate and ultimately returns water and valuable solutes to the blood is known as
Which part of the nephron show contains urine
Which part of the nephron shown is permeable to urea?
Which of the following options correctly lists the structures in the kidney in order in which fluid flows through them?
Glomerulus, bowman's capsule, proximal tubule, loop of henle, distal tubule
The first step in the formation of urine is the
Formation of filtrate that accumulates in Bowman's capsule
Which art of the nephron shown is its collecting duct?
Which part of the nephron shown is its proximal tubule?
What is the name of the functional unit of the kidney?
Through which of the following structures does urine leave the bladder?
Which part of the nephron shown is its loop of Henle?
Which of the following statements regarding the urinary system is true?
Bowman's capsule envelopes the glomerulus
Which part of the nephron shown will cause it to be classified as a juxtamedullary nephron?
Which part of the nephron shown contains the glomerulus?
Which part of the nephron shown is its distal tubule?