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Chapter 5: Problem 11

The action opposite to extension is a. abduction. b. rotation. c. flexion. d. pronation.

Short Answer

Expert verified
c. flexion.

Step by step solution

01

Understand the Question

The question asks to identify which term describes the action opposite to 'extension'.
02

Define Extension

Extension is the straightening movement that increases the angle between body parts. For example, straightening the elbow or knee increases the angle at those joints.
03

Analyze the Options

a. Abduction: Moving a limb away from the midline of the body.b. Rotation: Movement around the longitudinal axis.c. Flexion: Bending movement that decreases the angle between body parts.d. Pronation: Rotational movement where the hand and upper arm are turned inwards.
04

Determine the Opposite of Extension

The opposite of extension is flexion, as flexion decreases the angle between body parts while extension increases it.
05

Choose the Correct Answer

Based on the definitions and analysis, the correct answer is c. flexion.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

extension
Extension is a common type of joint movement. It involves straightening a limb at a joint, which increases the angle between the bones of the limb. For example, when you straighten your elbow or knee, you're performing an extension. This action is essential in various functional activities like reaching for objects, walking, and standing upright.
flexion
Flexion is the opposite of extension. It is the bending movement that decreases the angle between the bones of a limb at a joint. Imagine bending your elbow or knee; the bones in these joints come closer together as the angle decreases. Flexion is critical in many routines like sitting, bringing food to your mouth, or performing squats.
joint movements
Joint movements allow the various parts of the body to perform a wide range of activities. They include actions such as flexion, extension, abduction (moving a limb away from the body), adduction (moving a limb toward the body), rotation (moving around a longitudinal axis), and pronation (turning the hand inward). Understanding joint movements is key to grasping how our musculoskeletal system operates. Each movement type plays a specific role in our flexibility and mobility.
body angles
Body angles refer to the degrees of separation between bones in our body at the joints. Different joint movements alter these angles significantly. For instance, during flexion, the angle between the bones becomes smaller, while during extension, the angle increases. Recognizing these angles helps in understanding the physical mechanics of how our body moves and functions. Proper knowledge of body angles is especially crucial in fields like physical therapy, sports science, and fitness training.

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