Volume 1 Unit 4 Part 3

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Questions and Answers

The ______ system provides a strong framework.

The _________ system provides the tubing for fuel and oxygen to travel the thousands of miles to keep muscles working.

The ______ system keeps us aware of our surroundings

The ________ system supplies the blood with oxygen.

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Which system rids the body of processed wastes?

<p>Urinary (C)</p> Signup and view all the answers

The ________ contains all the interlocking systems

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________ are the engines of the body.

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What is the most incredible part of the human body? Why?

<p>The brain. It allows us to think. (B)</p> Signup and view all the answers

What are the most common chemical elements in the body?

<p>Carbon, hydrogen, oxygen, and nitrogen. (C)</p> Signup and view all the answers

What is the most common molecule in the human body?

<p>Water (B)</p> Signup and view all the answers

How much of the human body is made up of water?

<p>65 percent. (D)</p> Signup and view all the answers

Some serve as building blocks for cells; others speed up the chemical reactions within the body.

<p>Proteins (B)</p> Signup and view all the answers

Which macromolecules carry instructions that tell each cell how to perform its particular jobs

<p>Nucleic acids (C)</p> Signup and view all the answers

Which macromolecules provide energy that powers all the body’s activities

<p>Carbohydrates (D)</p> Signup and view all the answers

Some store extra fuel; others serve as building materials for the cells that make up the body.

<p>Lipids (A)</p> Signup and view all the answers

What is the basic unit of all living things?

<p>The cell (A)</p> Signup and view all the answers

What are the four main kinds of tissues in the body?

<p>Epithelial, connective, muscle, and nervous (B)</p> Signup and view all the answers

What is the largest organ of the body?

<p>The skin, or integumentary system (D)</p> Signup and view all the answers

Name the three layers of skin.

<p>Epidermis, dermis, and subcutaneous tissues. (C)</p> Signup and view all the answers

The innermost layer of the skin is called the __________.

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Which layer of skin protects the body’s inner tissues from the harsh rays of the sun?

<p>The epidermis (C)</p> Signup and view all the answers

Middle layer of the skin

<p>Dermis (A)</p> Signup and view all the answers

The ___________________ is the layer of skin that cushions the inner tissues against blows to the body.

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The ________ forms the outermost layer of the skin.

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Nerve endings in the ___________ respond to cold, heat, pain, pressure, and touch.

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The __________________ provides extra fuel for the body

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The __________ serves as a barrier between the outside world and the inner tissues of the body

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The _________ helps keep the temperature of the body within its normal range

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The ___________ consists of tough, dead cells

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The ___________ prevents the loss of water from the tissues.

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The _________ serves as an important sense organ.

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Give some examples of how the skeletal system protects internal organs.

<p>The brain is shielded by the skull, the spinal cord by the spinal column, and the heart and lungs by the ribs. (D)</p> Signup and view all the answers

The place where bones meet is called a _______.

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What are the two basic kinds of joints?

<p>Movable and fixed joints (A)</p> Signup and view all the answers

What holds movable joints together?

<p>Ligaments (B)</p> Signup and view all the answers

How does bone tissue play a role in keeping the blood healthy?

<p>Bone marrow produces new blood cells and releases them into the bloodstream. (D)</p> Signup and view all the answers

What are the main tasks of the muscles?

<p>Move limbs, push food through the gut, make the heart beat, and control blood flow around the body (C)</p> Signup and view all the answers

What are the three main types of muscles?

<p>Skeletal, smooth, and cardiac (A)</p> Signup and view all the answers

Why are skeletal muscles sometimes called “voluntary muscles”?

<p>Because humans cause them to move at will (B)</p> Signup and view all the answers

How do muscles move the body?

<p>By pulling. (C)</p> Signup and view all the answers

How do smooth muscles differ in appearance from skeletal muscles?

<p>They do not have striations like skeletal muscles. (B)</p> Signup and view all the answers

Why are smooth muscles sometimes called “involuntary muscles”?

<p>They contract and relax automatically; they are not consciously controlled (D)</p> Signup and view all the answers

Name the muscle that has characteristics of both the skeletal and smooth muscles.

<p>Cardiac muscle. (A)</p> Signup and view all the answers

What is the main part of the digestive system?

<p>Alimentary canal, or gut (B)</p> Signup and view all the answers

What kind of process is digestion?

<p>One of the chemical reactions sped up by enzymes (C)</p> Signup and view all the answers

What reactions happen during digestion?

<p>Starches and complex sugars break down into simple sugars, fats become fatty acids and glycerol, and proteins break down into amino acids. (A)</p> Signup and view all the answers

Where does digestion begin?

<p>In the mouth (B)</p> Signup and view all the answers

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