Thursday
September 18, 2014

Homework Help: Science Please Check My Answers For Me

Posted by Mstv on Tuesday, June 3, 2014 at 12:16pm.

1. What do bone marrow and the epidermis have in common?
A. They are both sites of new cell formation.****
B. They both contain structures that assist the body in cooling down if overheating occurs.
C. They both contain or are associated with sensory neurons.
D. They are both involved in waste disposal functions.

2. Why are capillaries and not arteries or veins found in alveoli, nephrons, and villi?
A. Vessels must be small so that very little blood enters these tissues.
B. Vessels must be narrow so that only very small molecules can reach these tissues.
C. Vessel walls must be thin to allow ease of transfer of molecules to these tissues.****
D. Vessels must be lightweight so that they do not interfere with the movements of these tissues.

3. Which of these structures relies on the circulatory system to transport the chemical compounds that it makes to other body structures?
A. neuron
B. salivary gland
C. sweat gland
D. pituitary gland***

4. Which of the following must be true of the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction?
A. Axons and muscle cells must both have structures that make and secrete the same small molecules.
B. Axons and muscle cells must both have receptors that recognize the same small molecules.
C. Axons must have structures that make and secrete molecules, and muscle cells must have receptors that recognize these molecules.****
D. Muscle cells must have structures that make and secrete molecules, and axons must have receptors that recognize these molecules.

5. Which of the following body systems does not rely on the autonomic nervous system to stimulate involuntary events?
A. skeletal system ****
B. digestive system
C. circulatory system
D. respiratory system

6. Which of the following body systems has a component that stops functioning and leads to diabetes?
A. endocrine system ****
B. digestive system
C. circulatory system
D. nervous system

7. Which of the following pairs of structures share the function of reabsorbing water into the body?
A. lungs, stomach
B. bone marrow, small intestine
C. hypothalamus, pancreas
D. large intestine, kidney ****

8. Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens?
A. integumentary system
B. nervous system
C. circulatory system
D. endocrine system

9. Which of the following diseases is not explained by germ theory?
A. malaria
B. HIV
C. cancer****
D. flu

10. Which of the following can a hospital do to help reduce the spread of infectious diseases?
A. Have patients wash often using antibacterial soap.
B. Keep infected patients confined, and limit visitors.****
C. Serve food to patients in paper bowls, and dispose of waste in the trash.
D. Do not allow cleaning personnel into rooms occupied by infected patients.

11. How are viruses, bacteria, fungi, and protists similar?
A. are all living organisms.
B. They are all the same size.
C. They are all only visible with the aid of a microscope.
D. They are all infectious agents of disease.*****

12. Which of the following types of pathogens can only reproduce itself if it takes over host cells?
A. fungi
B. bacteria
C. virus
D. protozoa****

13. Bacteria are invisible to humans except under a microscope. Which evidence did Pasteur use to show that bacteria were the cause of soured wine?
A. Heated wine did not sour.
B. Capped wine did not sour.
C. Filtered wine did not sour.*****
D. Chilled wine did not sour.

Fill in the Blank

14. The layer of skin that contains nerves and blood vessels is the _________ (1 point)

15. ________ digestion occurs in the small intestine through the action of enzymes. (1 point)

16. Urea, excess water, and other waste materials are eliminated in a water fluid called ______________. (1 point)

17. ______________ can cause infections by injecting their DNA or RNA into hosts. (1 point)

18. The human immune system produces ______________ in response to a vaccine, which later can bind to and destroy a pathogen if it invades.

20. ______________ are structures that link bone to bone at a joint.

21. In the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the ______________.

My Answers To Fill In The Blank

14. Dermis
15.Chemical
16. Urine
17.
18. memory cells
20. Ligaments
21. Large Blood Vessels

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