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arm

Primary Information
Secondary Information

Definition

Arm is a limb that extends from the shoulder to the hand. It is used for a variety of purposes, including grasping objects, moving the body, and expressing emotions.

The arm is made up of three bones: the humerus, the radius, and the ulna. The humerus is the longest bone in the arm and it connects the shoulder to the elbow. The radius and ulna are the two bones in the forearm. The radius is located on the thumb side of the forearm and the ulna is located on the pinky side of the forearm.

The arm is also home to a number of muscles, including the biceps, triceps, and forearm muscles. These muscles allow the arm to move in a variety of ways, including flexion, extension, abduction, and adduction.

The arm is a complex and important part of the human body. It allows us to interact with our environment and to express ourselves.

How can the word be used?

The boy's arm was like a tree trunk.

arm

Different forms of the word

Noun: arm.

Adjective: armed, armless.

Adverb: arm in arm.

Verb: to arm, arm oneself, disarm.

Pronoun: arms.

Etymology

The word "arm" comes from the Old English word "arm," which means "upper limb." The Old English word "arm" is derived from the Proto-Germanic word "*armz," which also means "upper limb.".

Question

What is your arm made up of?

AQA Science Exam Question and Answer

Question:

Define the term "arm" in the context of human anatomy. Describe the main bones and muscles involved in the movement of the arm.

Answer:

  • In the context of human anatomy, the "arm" refers to the upper limb of the body, extending from the shoulder to the elbow, and further extending to the wrist and hand.

Main Bones and Muscles Involved in Arm Movement:

Bones:

  • Humerus: The long bone of the upper arm, connecting the shoulder to the elbow.
  • Radius and Ulna: The two bones of the forearm, extending from the elbow to the wrist.

Muscles:

  • Biceps Brachii: Located at the front of the upper arm, the biceps brachii muscle flexes the elbow joint, allowing for movements like bending the arm and bringing the forearm towards the shoulder.
  • Triceps Brachii: Situated at the back of the upper arm, the triceps brachii muscle extends the elbow joint, allowing for movements like straightening the arm.