Chapter 2 Flashcards
what works together to create human movement system?
nervous, skeletal, and muscular system.
what are the two parts of the nervous system and what do they do?
the central nervous system and peripheral nervous system. Senses an internal and external environment, collects info and interprets it to send back to the body so it can act accordingly
what is the central nervous system?
the part of the nervous system that is responsible for being the primary decision maker for the body
what is the peripheral nervous system and what does it do?
the PNS is made up of all of the nerves that extend from the CNS
and then acts as a messenger sending signals to and from the CNS
neurons are comprised of which three parts
cell body, axon, dendrites
what is the functional unit of the nervous system?
neuron
what are sensitive to changes in tensions and the rate of that change, protecting a muscle from possible injury?
muscle spindles
ie: sensing muscular length activating the muscle spindle causing the muscle to contract to avoid excessive tension or stretching
In the endocrine system, which of the following secretes hormones such as corticosteroids and catecholamines in response to stress?
thyroid gland
what sensory receptor will encourage a muscle to relax when excited?
golgi tendon organ, the muscle relaxes to avoid excessive tension
Which of the following is made up of the upper and lower extremities as well as the shoulder and pelvic girdles and encompasses approximately 126 bones?
the appendicular system
What are responsible for sensing distortion in body tissues through stretch, pressure and touch, and are located in muscles, tendons, ligaments, and joint capsules?
mechanoreceptors
Which term refers to a system of glands that secrete hormones into the bloodstream to regulate a variety of bodily functions and consists of host organs, chemical messengers, and target cells?
the endocrine system
The body’s ability to differentiate between walking on concrete and walking on sand is an example of which of the following functions of the nervous system?
sensory
Which of the following glands releases growth hormone during childhood up until puberty?
pituitary gland
What is the main characteristic of motor (efferent) neurons?
they stimulate muscle contraction and create movemement
which of the following is not a characteristic of (type 2) fast twitch muscle fibers?
slow to fatigue