The longest bone in human body is

Appeared in: KGMU 2024

Explanation

The femur, or thigh bone, is the longest, strongest, and heaviest bone in the human body, as confirmed by anatomical texts.
It extends from the hip to the knee, forming the structural support for the thigh.
Its length and strength are essential for supporting the body's weight and enabling locomotion, such as walking and running.

Option B: The humerus is the bone of the upper arm.
Option C: The tibia, or shin bone, is the second longest bone in the body, located in the lower leg, but it is shorter than the femur.
Option D: The fibula is the thinner, lateral bone of the lower leg and is significantly shorter and less robust than the femur.

Visual 1: Diagram - An illustration of the full human skeleton, with the Femur, Humerus, Tibia, and Fibula clearly labeled to provide a visual comparison of their relative lengths and positions.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Human Skeletal System as background academic context rather than a clinical decision trigger.
A fracture of the femur is a serious medical emergency due to the large force required to break it. It can lead to significant pain, disability, and life-threatening complications like hemorrhage (up to 1.5 liters of blood loss into the thigh) and fat embolism.
Nurses play a critical role in managing patients with femur fractures, including monitoring vital signs for shock, managing pain, performing neurovascular assessments of the affected limb, and preventing complications like deep vein thrombosis (DVT).
What if the patient was a child? In children, a femur fracture might be treated with a spica cast, whereas adults often require surgical intervention with rods or plates (internal fixation).

How to Approach the Question

This is a factual recall question based on fundamental knowledge of human anatomy.
Identify the core of the question: which bone is the 'longest'.
Mentally picture or recall the major bones of the limbs: the arm bone (humerus), the thigh bone (femur), and the lower leg bones (tibia and fibula).
Visually or conceptually compare their lengths. The bone in the thigh is clearly the longest single bone in the body.
Match this understanding (femur) to the given options and select the correct one.

Concept Tested & Keywords

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Practise the full KGMU 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.