Nutricion parcial 2

The human body is made up of billions of smaller structures. What are the four major kinds of these structures?

• Cells; tissues; organs; and systems
• Bones; muscles; organs; and blood
• Head; torso; arms; and legs
• Heart; lungs; brain; and liver

Answer explanation

Correct! The human body is organized in increasing complexity from cells to tissues to organs to systems.

What are cells defined as in the human body?

• The simplest units of living matter that can maintain life and reproduce themselves
• The largest structures in the human body
• Organizations of several different kinds of tissues
• Spaces filled with cerebrospinal fluid

Answer explanation

Correct! Cells are the fundamental building blocks of life with the ability to maintain life and reproduce.

A tissue is best defined as:

• An organization of many similar cells with intercellular substance between them
• A single cell that can reproduce itself
• An organization of several different kinds of tissues
• The external covering of the body

Answer explanation

Correct! Tissues consist of groups of similar cells working together with materials between them.

Which statement best describes an organ?

• An organization of several different kinds of tissues arranged to perform a special function
• A group of many similar cells
• The simplest unit of living matter
• A collection of body systems

Answer explanation

Correct! Organs are complex structures made of multiple tissue types working together.

How many organ systems does the human body have?

• 11 systems
• 8 systems
• 15 systems
• 5 systems

Answer explanation

Correct! The human body has 11 major organ systems that work together to sustain life.

On the outside human anatomy consists of how many basic parts?

• Five basic parts: head; neck; torso; arms; and legs
• Three parts: head; torso; and limbs
• Seven parts including hands and feet
• Four parts: head; trunk; and two limbs

Answer explanation

Correct! These are the five main external divisions of the human body.

What percentage of the human body is composed of water?

• 62%
• 16%
• 50%
• 80%

Answer explanation

Correct! Water makes up approximately 62% of the human body's composition.

Which element is the most abundant in the human body?

• Oxygen (65%)
• Carbon (18%)
• Hydrogen (9.5%)
• Nitrogen (3.2%)

Answer explanation

Correct! Oxygen is the most abundant element comprising 65% of body mass.

The skeletal system is composed of:

• Bones and cartilages
• Only muscles and tendons
• Blood vessels and nerves
• Skin and hair

Answer explanation

Correct! The skeletal system consists of bones and cartilages that provide structure and support.

The skeleton is divided into two parts. The axial skeleton consists of:

• Bones of the head and trunk
• Bones within the limbs and supporting girdles
• Only the bones of the arms
• The joints and ligaments

Answer explanation

Correct! The axial skeleton forms the body's central axis including the skull spine and ribcage.