The arrector pili muscles, also known as hair erector muscles, are small muscles attached to hair follicles in mammals. Contraction of these muscles causes...

predators. Goose bumps are created when tiny muscles at the base of each hair, known as arrector pili muscles, contract and pull the hair straight up. The...

hair. Attached to the follicle is a tiny bundle of muscle fiber called the arrector pili. This muscle is responsible for causing the follicle lissis to...

bladder, blood vessels, and the arrector pili in the skin that control the erection of body hair. Skeletal muscle is broadly classified into two fiber...

making the ancestor appear larger and scaring off predators. The arrector pili (muscle that connects the hair follicle to connective tissue) contracts...

the hair is raised is called piloerection. The contraction of the arrector pili muscle associated with each hair follicle causes the hair to become erect...

units, each with hair follicle, sebaceous gland, and associated arrector pili muscle. In the embryo, the epidermis, hair, and glands form from the ectoderm...

oil producing sebaceous gland which lubricates the hair and the arrector pili muscles, which are responsible for causing hairs to stand up. In humans...

ciliary muscles change the shape of the lens to focus on objects in accommodation. In the skin, smooth muscle cells such as those of the arrector pili cause...

into and out of the body. When goose bumps are observed, small muscles (arrector pili muscle) contract to raise the hairs either to provide insulation, by...