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Erector muscles under the skin, in the pores make the hair stand up when your brain is stimulated by fear. It's to do with fight or flight, and appearing more threatening to the attacker. This is unesessary for most humans today because we don't engage in much interaction with predatory animals, and we are not put in many situations where we are regarded as prey. It is also to notify us when we are cold.
Wiki User
∙ 9y ago
Wiki User
∙ 15y agoMain Entry: arrector pi·li muscle
Pronunciation: -p-l-, -pil--
Function: noun
: one of the small fan-shaped smooth muscles associated with the base of each hair that contract when the body surface is chilled and erect the hairs, compress an oil gland above each muscle, and produce the appearance of goose bumps -- called also erector pili muscle, pilomotor muscle
Learn more about "arrector+pili+muscle" and related topics at Britannica.com
Wiki User
∙ 13y agoHumans do not need to move their ears to hear, but those muscles have nothing to do with hearing sound (there are muscles in the middle ear which do) BUT with the location of sound.
The shape of the human ear is a type of phase-delay echo chamber;
this phase delay gives us an up-down orientation to a sound.
The phase difference of the sound from each ear gives us right-left orientation.
This method is much quicker than turning either the ears OR the head to locate a sound source.
Wiki User
∙ 13y agoWe can't move our ears so it is not vestigial
Andrew McCormick
The muscles that moves the ears became vestigial because who needs 'em
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What muscle moves the ear?
You can't move the ears so there is no muscles that can move the ears.
What is the probable function of the muscle that moves the ears?
The probable function of the muscles that USE TO move the ears is to hear behind or in front or to the side. Like a cat will do. These are considered to be "leftovers" like the wisdom teeth.
What is the function of the coccygeus muscle?
In humans this is considered a vestigial, or no longer needed/used. In many animals, the coccygeus muscle is used to wag their tails.
What type of muscle moves bones?
Skeletal Muscles.
Is xiphoid process vestigial?
No. It's not vestigial. "The xiphoid process anchors several important muscles, including the abdominal diaphragm, a sheet-like muscle that is necessary for normal breathing. It also anchors the rectus abdominus muscle (the "abs," responsible for the bodybuilder's "sixpack") and the transversus thoracis muscle, located just inside the front of the ribs."
How many vestigial organs in your body?
The answer to questions such as this hinges on a definition. What is vestigial? Experts disagree about whether some organs are vestigial, so it is not possible to answer the question as asked without listing the candidates and deciding whether each is vestigial. Perhaps the best example is the appendix. While some consider it to be vestigial, i.e. to be a reflection of our evolutionary past but to have no current function, others consider it to be an important reservoir for friendly bacteria that aid in digestion. Another example is nipples in males. While they are not essential to the survival of the species, their stimulation appears to trigger the release of hormones that are important in pair bonding. Having said that, here's a list of candidates. You count them, and you decide which ones are vestigial. Nictitating membrane (third eyelid) Wisdom teeth Subclavius muscle Male nipples Appendix Plantaris muscle Vomeronasal organ Palmaris muscle Erector pili Body hair Pyramidalis muscle Epoophoron (aka parovarium)
What muscle in your body that moves on their own we call them involuntary muscle?
heart muscle
When your muscle shortens and moves a load?
muscle fibers contracting
What type of muscle tissue moves the heart?
The cardiac muscle
What is the term for structure that has no use in an organism?
Vestigial StructureA vestigial structure is a structure that appears to no longer have a use in the body.
Why are muscles that move the ear vestigial?
Because the muscles that we use to move ears are used by other animals to help with detecting interesting sounds (like when you see a dog's ears twitch when they hear something). Since those muscles aren't serving our bodies in that sense, and we really only use those muscles to wiggle ears for fun, they can be considered vestigial (ie. present in our bodies, but not really doing anything: like our tailbone, or our appendix)
Why does your ears stop up when you swallow?
Because your jaw is closely connected to your ears and your jaw moves when you swallow. That is also how you wiggle your ears.
