Q. 4 - Biology

Question

The forearm consists of the: 

1. radius and ulna 
2. radius and humerus 
3. ulna and humerus  
4. humerus and carpus 

Step-by-Step Solution

Answer

The correct answer is option (a).

The forearm consists of the radius and ulna.

Step 1 : Introduction

• The forearm is made up of two long bones (the radius and ulna), an interosseous membrane, and numerous arteries, nerves, and muscles. 
• The muscles are divided into two groups: anterior and posterior. 
• These muscles are responsible for the flexion and extension of the wrist and fingers, as well as elbow flexion. 

Step: 2 Explanation for Correct answer

• The forearm is made up of two long bones called the radius and ulna. 
• The radius is located medially, is longer and larger than the ulna, and travels laterally parallel to the ulna.
• The separating interosseous membrane holds these two bones together.
• There are two points at which the forearm bones join. Thus, the option a is correct.

Step: 3 Explanation for incorrect answer

• The humerus is a long bone that connects the elbow to the shoulder and scapula. So, option b is wrong.
• The humerus and ulna's curving shapes are joined by articulation. The Radius, a smaller forearm bone, is situated outside of the joint. . So, option c is wrong as well.
• The eight little bones that make it up the wrist, or carpus, which connects the hands to the forearm, are known carpal bones. Hence, option d is wrong too.