Muscles Must Be Arranged in Antagonistic Pairs, Because When a Muscle

question 45

Multiple Choice

Muscles must be arranged in antagonistic pairs, because when a muscle contracts:

• A)it lengthens and pulls at the same time
• B)it can only push a bone in one direction
• C)it pulls one way and pushes another
• D)it can only pull a bone in one direction

---

Definitions:

Subject Variables

Characteristics of study participants that are not manipulated but can affect the outcome of an experiment, such as age, gender, intelligence, or personality.

Field Experiments

Research studies conducted in natural settings outside the laboratory to understand real-world behaviors and outcomes.

Natural Context

The original or genuine environment in which a subject or phenomenon naturally occurs, without artificial interference.

Independent Variable

The variable that is intentionally changed by the researcher in an experiment to see if it produces an effect.