Exercise: Are You Familiar with the Word, "Trenchant?" Provide a Definition

question 312

Short Answer

Exercise: Are you familiar with the word, "trenchant?" Provide a definition. If the term is unfamiliar, make a guess about its meaning based on its appearance or sound, and create your own definition. Then look the word up, and find out how close you got. (We provide a thumbnail meaning as answer.)

Explain the importance of various cell types and tissues in the support, protection, and growth of plants.

Understand dendrochronology and its significance in studying past climatic conditions.

Describe the mechanisms of transpiration and its importance in plants.

Understand the differences between hardwood and softwood, including their composition and applications.

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Definitions:

Antigens

Substances that the immune system recognizes as foreign or dangerous, prompting an immune response.

Cardiac Output

The amount of blood pumped by the heart. One of the two major variables that determine blood pressure. Cardiac output is itself determined by two other variables: the rate at which the heart beats (commonly measured in beats per minute) and the amount of blood ejected from the heart (stroke volume). See also total peripheral resistance.

Blood Pressure

The force of circulating blood on the walls of blood vessels, often measured as an indicator of cardiovascular health.

Cellular Immunity

One of the three general categories of immune response, based on the action of a class of blood cells called T-lymphocytes. The “T” designation refers to the locus of their production, the thymus gland. Cellular immunity results from a cascade of actions of various types of T-lymphocytes.