Stem Cells Are

question 449

Multiple Choice

Stem cells are:

• A) long, threadlike structures composed of twisted parallel strands of deoxyribonucleic acid.
• B) cells that can divide indefinitely, renew themselves, and give rise to a variety of other types of cells.
• C) cells that have mutated or spontaneously changed during transmission from one generation to the next.
• D) cells that have been damaged by environmental factors, such as exposure to ultraviolet light, radiation, or chemical toxins.

---

Definitions:

Amygdala

The amygdala is a brain structure involved in emotion regulation, emotional learning, and the formation of fear-related memories.

Hierarchy of Needs

A theoretical framework in psychology proposed by Abraham Maslow, identifying different levels of human needs, from basic physical requirements to complex psychological growth, which motivate individual behavior.

Arousal Theory

Arousal Theory suggests that individuals are motivated to maintain an optimal level of arousal, with variations in this level driving behaviors towards achieving such balance.

Drive-reduction

A psychological theory that motivation arises from the need to reduce internal drives such as hunger or thirst.