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Biology Samples

Neurophysiology of nerve impulses

Respond appropriately to each statement below either by completing the statement or by answering the question raised. 1. The cellular unit of the nervous system is the neuron. What is the major function of this cell type? 2 and 3. What characteristics are highly developed to allow the neuron to perform this function? (hint two) 4. Would a substance that decreases membrane permeability to sodium increase or decrease the probability of generating a nerve impulse? 5. Why don't the terms depolarization and action potential mean the same thing? (Hint: under which conditions will a local depolarization not lead to the action potential?) 6. A nerve generally contains many thickly ...

Compare and contrast the composition of blood plasma and glomerular filtrate

Compare and contrast the composition of blood plasma and glomerular filtrate. Your friend is in a car accident and experiences a substantial amount of blood loss. The emergency room doctor tells you he is sending your friend to surgery to stop the bleeding however she is at a high risk for kidney failure. What does this mean? Why is renal failure such a major concern with blood loss? Be detailed in your explanation.

Digestive Track Layers & Liver Failure

A lab worker accidently spills a tray of slides you have just prepared of the length of the digestive tract, beginning with the esophagus and ending at the rectum. How would you know that the first slide you picked up off the floor and checked with the microscope was from the stomach? Describe the four basic layers of the digestive track in your response. How did you rule out the other regions of the digestive track when you viewed the slide microscopically? A patient comes into the office in liver failure. What macromolecule (Protein, lipid, or carbohydrate) will be most effected? Why?

Why does a lung collapse

A member of a gang was rushed to the emergency room with a stab wound to the left thorax. It was found that his left lung had collapsed. Why had his lung collapsed and why only his left lung

The Cardiac Cycle

In tracing a drop of blood from tissue cells of the left knee to the capillaries of the right arm including the lungs. What are the aspects of the cardiac cycle, keeping track of the left and right sides of the heart, and all the valves through which the blood travels?

Why only Eukaryotic cells have evolved into multicellular organisms.

Bacteria never form any sort of grouping that resembles a multicelled organism with an internal division of labor among its cells. Think about the attributes of prokaryotic bacterial cells and the eukaryotic cells of which all multicellular organisms are comprised. Develop some hypotheses explaining why only eukaryotic cells have evolved into multicellular organisms.

Mitosis and Meiosis Processes

Explain why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis? Meisis? What would happen if meiosis did not occur?

Hematocrit values

Give one possible explanation that hematocrit values are usually higher or lower in healthy males than in females.