Final answer:
The number of foreign objects introduced into the body during a hypodermic injection depends on the specific circumstances and precautions taken. Proper injection techniques, sterile equipment, and precautions can minimize the risk of introducing foreign objects.
Step-by-step explanation:
When giving a hypodermic injection, the number of foreign objects introduced into the body depends on the specific circumstances and precautions taken. In ideal situations, no foreign objects should be introduced into the body during an injection. However, there can be instances where foreign objects such as air bubbles or particles from the needle or syringe can be introduced accidentally.
The risk of introducing foreign objects can be minimized by following proper injection techniques, using sterile needles and syringes, and avoiding contamination. It is important for healthcare professionals to be trained in safe injection practices and to take necessary precautions to prevent such incidents.