Please choose the correct ending to complete the given sentence: Health: [header] How to identify a broken femur [title] Notice sudden and severe pain. [step] When you break your femur, the pain will be sharp, pulsating and excruciating. When the femur is broken, the pain receptors send pain signals to the brain and pain is perceived.

Ending1: Over time, these signals can slow the functioning of the femur and increase the release of pain signals throughout the joint and nerve. The release of these signals in the spinal cord is weaker than this by contrast with the involuntary alterations in nerve nerves as regenerative cartilage is passed down from nerve to bone. Ending2: This can be displayed by snapping the wrist tightly at the top of the broken femur. Signs of a broken femur include : [substeps] Swelling of the skin around the area where the broken femur is located. Ending3: [substeps] Pain that is amplified throughout an entire body is called " sound. " this pain is produced in the exact same way that a busted needle will sound when a medicine ball is injected. Ending4: This is not the type of pain you might not notice, it is extreme and intense. [substeps] Especially consider pain that intensifies upon weight bearing activity and exercise and subsides with proper rest.

Answer format: ending1/ending2/ending3/ending4