The arrector pili muscle is made to lift the hairs on the body, which causes air to get trapped between the hairs and provide a layer of insulation against the cold. These muscles can also react in cases of fear and give different results in humans than animals.
When a scared animal's arrector pili muscle reacts, its hair stands up making it appear larger and more intimidating. When a cat's tail and hair on its back stands up, that is a sign of fear and a defense mechanism. The cat appears larger to whatever might have scared it and often the appearance will send the other animal away. In humans, hairs stand up when someone is scared, but it does not make the person appear larger. It is more of a warning system to help alert people to remove themselves from a particular situation.Learn More
Injecting air into a muscle, which lies beneath the skin, is generally harmless, according to HealthTap.com. However, when administering drugs, such as insulin for diabetes, injecting air instead of insulin may result to an under dosage of the medication.Full Answer >
The deltoid is opposed by the pectoralis major and the latissimus dorsi when the arm is moved away from the body to the side. The deltoid group functions to stabilize the shoulder during rotation, preventing dislocation and allowing safe carrying of heavy objects.Full Answer >
The fixator muscles stabilize a section of the body when another section moves. The muscle allows the antagonist muscles to move effectively during normal movement or exercise.Full Answer >
The diaphragm is made of skeletal muscle tissue. Any cell that has the ability to contract is considered a muscle cell. Skeletal muscles are typically voluntary muscles, which means that people can control when they contract and relax.Full Answer >