7th Grade Science                        Body Systems                        Name: ________________________

 

1. List the 5 steps of the scientific method:

  1.  
  2.  
  3.  
  4.  
  5.  

 

2. A hypothesis that passes its test becomes a:  (a) better hypothesis   (b) theory    (c) law

 

3. Scientists test hypotheses with  (a) experiments   (b) test tubes     (c) final exams

 

4. List 3 organs of the digestive system:

            1.

            2.

            3.

 

5. Organ containing strong acid to digest food:  (a) liver     (b) esophagus   (c) stomach

 

6. Longest organ of the digestive system: (a) small intestine  (b) large intestine  (c) mouth

 

7. Connects the mouth to the stomach:  (a) liver     (b) esophagus   (c) small intestine

 

8. Which organ belongs to the circulatory system?

 (a) heart   (b) brain   (c) stomach   (d) lungs

 

9. The human heart has ____________ chambers. (Hint: put in a number less than 10)

 

10. Give one material blood carries to the rest of the body: ___________________

 

11. The lungs belong to the ( UPPER  OR  LOWER ) respiratory system.

 

12. The lungs help our bodies absorb: (a) water   (b) carbon dioxide  (c) oxygen   (d) food

 

13. Pneumonia and tuberculosis (TB) primarily affect which system?

                                    (a) circulatory      (b) nervous    (c) respiratory    (d) digestive

 

14. Colds are common upper respiratory infections caused by:

                                    (a) drafts       (b) ghosts     (c) bad smells    (d) rhinoviruses

 

15. The large artery carrying blood from the heart: 

                                    (a) aorta     (b) jugular     (c) carotid     (d) vena cava

 

16. Explain briefly what we did in the lab this week:

Doctors Try New Device to Block Aneurysms    By Joann Loviglio

A device that resembles a child's finger trap toy is being used to treat a type of aneurysm near the heart that often grows without any symptoms until it bursts, usually with fatal consequences.

The device, manufactured by W.L. Gore and Associates Inc., of Flagstaff, Ariz., is made of Teflon-like material with an outer metallic support structure. It is the first FDA-approved grafting system for treating aneurysms of the descending thoracic aorta.

Thoracic aortic aneurysms are diagnosed in approximately 15,000 people annually. Because they often cause no symptoms, they are typically spotted when a patient is being treated for another condition.

If the aneurysm bursts, the person can quickly die of internal bleeding.

"The treatment options have been either open surgical repair or no repair at all," said Dr. Joseph Bavaria, a Penn cardiac surgeon and one of the lead investigators during trials of the device.

It's an option for elderly patients and others who would be unable to withstand the traditional surgery, which involves making a 12- to 14-inch-long opening in the chest and removing the diseased part of the aorta while the patient is kept alive on a heart-lung machine, Bavaria said.

To implant the new device, doctors make a two- to three-inch incision in the patient's abdomen or groin and guide a catheter with the compressed stent through an artery and into the diseased part of the aorta. When they withdraw the catheter, the flexible stent springs open and expands to the width of the aorta, creating a new aortic lining and sealing off blood flow into the aneurysm "bubble."

Without blood to feed it, the bubble typically shrinks over time, said Dr. Jeffrey Carpenter, a Penn vascular surgeon who also was involved in the clinical trials.

Precise placement is crucial: Once the stent is expanded, it cannot be readjusted. Doctors test on computer models before surgery to see what stent length and diameter will work best; in the operating room they guide the stent to the proper position by real-time X-ray images viewed on a monitor.

 

Questions:

17. What is the name of this often-fatal condition the doctors have developed their stent to treat?

                        ________________________________________________

 

18. How is it dangerous (How can it kill the patient)?

 

________________________________________________________________________

 

________________________________________________________________________

 

19. What organ is badly affected by this condition? ________________________

 

20. Is the surgery involved as dangerous as the old methods of treatment? __________

Why?