lesson 2 ultraviolet (uv) rays can put a person at risk for developing cancer. how does each item in...

Lesson Lesson 22

Ultraviolet (UV) rays can put a person at risk for developing cancer.

How does each item in the picture help protect you from UV rays?

Cancer

Lesson Lesson 22In this lesson, you will learn to:

Lesson Objectives

• Describe the causes and types of cancer and the treatments for cancer

• Discuss the importance of early detection and warning signs

• Identify health behaviors that put you at risk for developing cancer

• Develop strategies to prevent noncommunicable diseases

Lesson Lesson 22What Is Cancer?

• The body’s cells are constantly growing and dividing.

• Most new cells are normal, but some are not.

• Sometimes these abnormal cells reproduce rapidly and uncontrollably, forming masses of abnormal cells inside otherwise normal tissue. This is called cancer.

Cancer

Lesson Lesson 22How Cancer Harms the Body

• Some tumors are benign.

• Benign tumors grow slowly and are surrounded by membranes that prevent them from spreading from the original site.

• Some tumors are also malignant.

• These tumors spread to neighboring tissues and through the blood or lymph to other parts of the body in a process called metastasis.

What Is a Tumor?

Lesson Lesson 22Classification of Cancers

Types of Cancer

• Lymphomas are cancers of the immune system.

• Leukemias are cancers of the blood-forming organs.

• Carcinomas are cancers of the glands and body linings, including the skin and the linings of the digestive tract and lungs.

• Sarcomas are cancers of connective tissue, including bones, ligaments, and muscle.

Lesson Lesson 22Common Cancers in the United States

• Skin: Most common type of cancer in the United States

• Breast: Second leading cause of cancer death for women

• Prostate: Found mostly in men over age 55

• Lung: Leading cause of cancer deaths in the United States

• Colon/Rectum: Second leading cause of cancer deaths in the United States

• Testicle: Most common cancer in men ages 15 to 34

How Cancer Harms the Body

Lesson Lesson 22How Cancer Develops

Risks Factors for Cancer

• Abnormal cells that have the potential to become cancer cells are produced every day, and the immune system destroys most of them.

• In some cases, normal cells change by themselves. In others, a faulty gene may have been inherited; between 5 to 10 percent of cancers are hereditary.

• Exposure to a carcinogen like cigarette smoke or ultraviolet light also increases the risk of cancer.

Lesson Lesson 22Factors Causing Cancers

Tobacco Use

Sexually Transmitted Diseases

Angina Pectoris

Dietary Factors

Radiation


Lesson Lesson 22Tobacco Use

• Recent studies attribute nearly one in five deaths to smoking or exposure to secondhand smoke.

• About 87 percent of lung cancer deaths are caused by smoking. An additional 25 percent of females who smoke will die of other smoking-related diseases.

• At least 43 different carcinogens have been identified in tobacco and tobacco smoke.

• Smokeless tobacco use is a major risk factor in the development of oral cancer. Oral cancer kills roughly one person every hour.


Lesson Lesson 22Sexually Transmitted Diseases

• Some viruses, such as the human papillomavirus (HPV) and the hepatitis B virus, cause cervical and liver cancers, respectively.

• The risk of acquiring these pathogens can be reduced by abstinence from sexual activity and from injecting drugs through infected needles.


Lesson Lesson 22Dietary Factors

• Approximately 30 percent of all cancer deaths are caused by dietary risk factors. A diet that is high in fat and low in fiber is often linked with cancer.

• Choosing foods low in fat and high in fiber reduces the risk of colon, breast, and prostate cancers.


Lesson Lesson 22Radiation

• Ultraviolet (UV) radiation from the sun is the main cause of skin cancer.

• Tanning beds and sunlamps also emit UV radiation, which is just as damaging as the sun’s rays. A “tan” is the body’s response to being injured by UV rays.


Lesson Lesson 22Ways to Prevent Radiation

Reduce your exposure to UV light by avoiding tanning beds and sunlamps.

Limit your time in the sun, especially between 10:00 A.M. and 4:00 P.M.

When you must be in the sun, wear Protective clothing.

Use a sunscreen that has an SPF (Sun Protection Factor) of at least 15 and that blocks all types of UV radiation.


Lesson Lesson 22Reducing Your Risk

A Word of Caution About Cancer

Lesson Lesson 22How You Can Reduce Your Risk of Cancer

Practice abstinence from sexual activity to reduce the risk of sexually transmitted diseases.

Be physically active.

Maintain a healthy weight.

Eat nutritious foods.

Follow an eating plan that is low in saturated fat and high in fiber.

Recognize the warning signs of cancer.

Reducing Your Risk

Lesson Lesson 22Detecting and Treating Cancer

Detecting Cancer

• The survival rate for those with cancer depends on the type of cancer and how early it is detected.

• Early detection is the most critical factor in successful cancer treatment. Many types of cancer can be detected through self-examination of the breasts, testes, and skin.

• The current five-year survival rate with early detection is about 80 percent. With regular screenings, the rate could increase to 95 percent.

• A biopsy is usually necessary to determine whether cancer is present.

Lesson Lesson 22Treating Cancer

• The methods used to treat cancer depend on several factors, such as the type of cancer, whether the tumor has spread, and the patient’s age and health.

• Cancer that responds to treatment or is under control is said to be in remission.

• Cancer in remission is not always cured; it can recur, sometimes years later.

Detecting and Treating Cancer

Lesson Lesson 22Methods Available for Treating Cancer

• Surgery removes some or all of the cancerous masses from the body.

• Radiation therapy aims rays from radioactive substances at cancerous cells. The radiation kills the cells and shrinks the cancerous mass.

• Chemotherapy uses chemicals to destroy cancer cells.

• Immunotherapy activates a person’s immune system to recognize specific cancers and destroy them.

• Hormone therapy involves using medicines that interfere with the production of hormones. These treatments kill cancer cells or slow their growth.


Lesson Lesson 22

Choose the appropriate option.

Q. An abnormal mass of tissue

that has no natural role in the body is a _______.

1. biopsy

2. metastasis

3. carcinogen

4. tumor

Quick Review

Lesson Lesson 22

Click Next to attempt another question.

A. 4. tumor

An abnormal mass of tissue that has no natural role in the body is a tumor.

Quick Review - Answer

Lesson Lesson 22


Q. The spread of cancer from

where it originates is called _______.

1. carcinogen

2. remission

3. metastasis

4. biopsy

Quick Review

Lesson Lesson 22


A. 3. metastasis

The spread of cancer from where it originates is called metastasis.


Lesson Lesson 22Quick Review


Q. A benign tumor does not

spread to other tissue; a malignant tumor does.

True

False

Lesson Lesson 22

A. True. A benign tumor does not spread to other tissue; a

malignant tumor does.



Lesson Lesson 22Quick Review


Q. Some cancer screening procedures

are intrusive and scare some people. It is important to urge that person to undergo the procedure because it is a prime action to avoid disease.

True

False

Lesson Lesson 22

A. True. Some cancer screening procedures are intrusive

and scare some people. It is important to urge that person to undergo the procedure because it is a prime action to avoid disease.



Lesson Lesson 22

End of Lesson 2

Click Home to view the Main menu.

Lesson Lesson 22

A. Correct! An abnormal mass of tissue that has no natural

role in the body is a tumor.



Lesson Lesson 22

You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer.


Lesson Lesson 22

A. Correct! The spread of cancer from where it originates is

called metastasis.



Lesson Lesson 22



Lesson Lesson 22

A. Correct! A benign tumor does not spread to other tissue;

a malignant tumor does.



Lesson Lesson 22



Lesson Lesson 22

A. Correct! Some cancer screening procedures are intrusive

and scare some people. It is important to urge that person to undergo the procedure because it is a prime action to avoid disease.



Lesson Lesson 22



Lesson Lesson 22What Is Cancer?

• The body’s cells are constantly growing and dividing.

• Most new cells are normal, but some are not.

• Sometimes these abnormal cells reproduce rapidly and uncontrollably, forming masses of abnormal cells inside otherwise normal tissue. This is called cancer.

Cancer is the uncontrollable growth of abnormal cells.

Cancer is the uncontrollable growth of abnormal cells.

Cancer

Lesson Lesson 22





What Is a Tumor?

Tumor is an abnormal mass of tissue that has no natural role in the body.

Tumor is an abnormal mass of tissue that has no natural role in the body.


Lesson Lesson 22





What Is a Tumor?

Benign means noncancerous.

Benign means noncancerous.


Lesson Lesson 22





What Is a Tumor?

Malignant means cancerous.

Malignant means cancerous.


Lesson Lesson 22





What Is a Tumor?

Metastasis is the spread of cancer from the point where it originated to other parts of the body.

Metastasis is the spread of cancer from the point where it originated to other parts of the body.


Lesson Lesson 22How Cancer Develops

• Abnormal cells that have the potential to become cancer cells are produced every day, and the immune system destroys most of them.

• In some cases, normal cells change by themselves. In others, a faulty gene may have been inherited; between 5 to 10 percent of cancers are hereditary.

• Exposure to a carcinogen like cigarette smoke or ultraviolet light also increases the risk of cancer.

A carcinogen is a cancer-causing substance.

A carcinogen is a cancer-causing substance.


Lesson Lesson 22Detecting Cancer

• The survival rate for those with cancer depends on the type of cancer and how early it is detected.

• Early detection is the most critical factor in successful cancer treatment. Many types of cancer can be detected through self-examination of the breasts, testes, and skin.

• The current five-year survival rate with early detection is about 80 percent. With regular screenings, the rate could increase to 95 percent.

• A biopsy is usually necessary to determine whether cancer is present.

Biopsy is the removal of a small piece of tissue for examination.

Biopsy is the removal of a small piece of tissue for examination.


Lesson Lesson 22Treating Cancer

• The methods used to treat cancer depend on several factors, such as the type of cancer, whether the tumor has spread, and the patient’s age and health.

• Cancer that responds to treatment or is under control is said to be in remission.

• Cancer in remission is not always cured; it can recur, sometimes years later.

Remission is a period of time when symptoms disappear.

Remission is a period of time when symptoms disappear.


lesson 2 ultraviolet (uv) rays can put a person at risk for developing cancer. how does each item in...

Documents

cancer cancer slide

cancer cells

risk of cancer

cancer abnormal cells

common type of cancer

development of oral

leading cause of cancer

percent of lung cancer