Measuring the Length of Real Human Small Intestines

The video explores the anatomy and measurement of human small intestines, comparing them to the commonly cited length of 20 feet. The instructor measures three intestines, finding variations in length, and discusses factors affecting these measurements, such as muscle tone and embalming. The video also compares human intestines to those of carnivores and herbivores, highlighting differences in digestive systems and their evolutionary implications.

What is the primary reason for measuring the small intestines in this lab session?

• To study the digestive process in detail

• To find a cure for digestive disorders

• To compare human intestines with animal intestines

• To verify the common belief about their length

What is the main function of the small intestine?

• Digestion of proteins

• Absorption of nutrients

• Storage of waste

• Production of digestive enzymes

Why might the small intestine appear shorter in a living person compared to a cadaver?

• Contraction of smooth muscle

• Presence of digestive enzymes

• Lack of blood flow

• Increased nutrient absorption

What was the length of the first small intestine measured in the lab?

• 13 feet 2.5 inches

• 10 feet 7.5 inches

• 17 feet 8 inches

• 20 feet

What factor can affect the length of the small intestine in cadavers?

• Type of diet

• Age of the person

• Embalming fluid

• Time since death

Which type of animal has the longest small intestine relative to its body size?

• Carnivores

• Omnivores

• Herbivores

• Insectivores

Why do herbivores have longer intestines compared to carnivores?

• To store more food

• To digest cellulose

• To produce more enzymes

• To absorb more water

What is the evolutionary advantage of having a varied intestinal length among humans?

• Increased resistance to diseases

• Greater energy storage

• Ability to digest a wide range of foods

• Faster metabolism

How does the small intestine length of omnivores compare to that of carnivores and herbivores?

• Same as carnivores

• Longer than both

• Shorter than both

• In between the two

What is the primary role of the small intestine in the digestive system?

• Breaking down fats

• Storing vitamins

• Producing bile

• Absorbing nutrients