An Irregular Galaxy Contains Mostly

question 20

Multiple Choice

An irregular galaxy contains mostly

• A) lower-main-sequence stars and giants.
• B) upper-main-sequence stars and giants.
• C) upper-main-sequence stars and gas and dust.
• D) upper- and lower-main-sequence stars and gas and dust.
• E) white dwarfs and supergiants.

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Definitions:

Counterflow

A process or system designed to move in the opposite direction of another flow to increase efficiency or facilitate a specific kind of exchange.

Loop of Henle

A U-shaped tube in the nephron of the kidney which plays a critical role in conserving water and in the concentration of urine.

Proximal Convoluted Tubule

A portion of the nephron in the kidney where a major amount of ion and water reabsorption from the filtrate occurs, playing a key role in the regulation of pH, electrolyte balance, and blood pressure.

Distal Convoluted Tubule

A portion of the nephron in the kidney involved in the selective reabsorption and secretion, playing a key role in regulating the body's salt and water balance.