Many of the Microbial Organisms That Are Periodically Epidemic in Human

question 186

Multiple Choice

Many of the microbial organisms that are periodically epidemic in human populations have

• A) short generation times and low mutation rates.
• B) short generation times and high mutation rates.
• C) long generation times and low mutation rates.
• D) long generation times and high mutation rates.
• E) long generation times and no mutations.

---

Definitions:

Isometric Contractions

Isometric contractions involve the muscle generating tension without changing its length, often used in strength training exercises.

Motor Units

A single motor neuron and all the muscle fibers it innervates, functioning as the basic functional unit in muscle contraction.

Muscle Twitches

Involuntary, fine movements of a small area of muscle, often caused by stress, fatigue, or mineral imbalances.

All-Or-None Principle

When a stimulus is applied to a cell, an action potential is either produced or not. In muscle cells, the cell either contracts to the maximum extent possible (for a given condition) or does not contract.