Living Environment Regents Review Practice Organization of Life Question 29
Sunday, 28 June 2009 12:55
Which statement accurately compares cells in the human circulatory system to cells in the human nervous system?
A)Cells in the circulatory system are identical in structure to cells in the nervous system.
B)Cells in the circulatory system carry out the same life function for the organism as cells in the nervous system.
C)Cells in the nervous system act independently, but cells in the circulatory system function together.
D)Cells in the nervous system are different in structure from cells in the circulatory system, and they carry out different specialized functions.
Correct Answer: Option D - Cells in the nervous system is different in structure from cells in the circulatory system, and they carry out different specialized functions.
The Circulatory System is the main transportation and cooling system for the body. The Red Blood Cells act like billions of little UPS trucks carrying all sorts of packages that are needed by all the cells in the body. Instead of UPS, we can call them RBCs. RBCs carry oxygen and nutrients to the cells. Every cell in the body requires oxygen to remain alive. Besides RBC's, there are also White Blood Cells moving in the circulatory system traffic. White Blood Cells are the paramedics, police and street cleaners of the circulatory system.
The passageways of the respiratory system are lined with a mucous membrane. From the nose to the bronchi, this epithelium is pseudostratified, ciliated and columnar. The bronchioles are lined by simple, ciliated columnar to simple cuboidal epithelial cells, while the alveolar ducts and the alveoli are lined by simple squamous epithelia. Embedded within the respiratory epithelium are specialised cells such as olfactory cells in the nasal cavity and goblet cells throughout most of the conduction portion. Olfactory cells are bipolar nerve cells which act as receptors for odour. Goblet cells secrete a mucous which functions to trap inhaled particles. Small mucous granule cells, known as brush cells due to their many microvilli, also secrete mucous. Short, basal cells rest on the basal lamina and don’t extend to the respiratory lumen. These cells are actively dividing and replace the other cell types.
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