The arrector pili muscles cause hairs to stand on end when the body is chilled. These are tiny muscles in the skin that connect hair follicles to skin tissue. The muscles contract due to information from autonomic nerves located within these muscles.
The arrector pili muscles are smooth, fan-shaped muscles. When the body becomes cold, these muscles contract, making the hairs connected to them stand on end. The muscle contractions press on nearby oil glands causing the skin to form "goose bumps." Other names for these muscles include erector pili muscles and pilomotor muscles. All mammals have these types of muscles.Learn More
In quadruped animals such as pigs, the sartorius muscle acts to adduct the hind leg, meaning it pulls the leg inward toward the center of the body. The sartorius muscle is located in the thigh and runs from the hip joint along the inside of the thigh to the knee.Full Answer >
Reference.com says that the function of chromosomes is to carry hereditary information. Chromosomes are located in the nucleus of a cell, and when a cell divides, so do the chromosomes.Full Answer >
Helicase is an enzyme that unwinds DNA strands. After it unwinds double-stranded DNA, two pairs of single-stranded DNA are available for replication, transcription and translation.Full Answer >
Centrosomes are organelles responsible for the organization and nucleation of microtubules in animal cells and also regulate the cell cycle during cellular division. When the nuclear membrane breaks down during mitosis, the chromosomes interact with the centrosome nucleated microtubules to build the mitotic spindle. The centrosome plays a key role in efficient mitosis, but it is not considered essential.Full Answer >