A&P Cpt 7
One somatic motor neuron is stimulated by how many muscle fibers
0
The neurotransmitter that is excitatory for skeletal muscles is called
Acetylcholine
What term best describes the relationship between the pronator quadratus and supinator
Antagonists
A sprinter has difficulty rising from a seated position and flexing his knee bending at the waist generates more pain what muscle is likely injured
Biceps femoris
While sitting at your desk, you drop your pencil onto the floor. You bend over to pick up the pencil. In order to straighten up and continue your exam you must use which of the following muscles?
Erector spinae
If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch the most likely result will be
Incomplete tetanus
Release of acetylcholine at a Neuromuscular junction
Increases permeability of the sarcolemma to the Na+
The term for shortening of the muscle while maintaining constant tension is
Isotonic contraction
The contraction strength of smooth muscle is relatively independent of its resting length partly because
It does not have sarcomeres
Which of the following best describes the attachment of the extensor digitorum
It indirectly attaches to all digits of the hand except the thumb
Which of the following is not a known cause of muscle fatigue
Lactic acid accumulation
The_____ attaches to the zygomatic arch and to the angle of the mandible
Masseter
Exposure to Clostridium tetani causes continuous release of acetylcholine. What effect does this have on smooth muscle?
No effect
A skeletal muscle generates the greatest tension when it is
Partially stretched before being stimulated
Drugs called calcium channel blocker's maybe used to lower blood pressure by causing arteries to vasodilate these drugs.....
Prevent calcium from entering smooth muscle allowing the muscle to relax
When a nurse draws blood it is not uncommon for the needle to penetrate which muscle near the cubital region
Pronator Teres
As you were lifting a box of someone places an extra weight on top of it for your muscles to continue contracting and lifting the box the muscle must
Recruit more muscle fibers
Which of the following would be caused by contraction of smooth muscle
Release of urine from the urinary bladder
The longest muscle in the human body is the
Sartorius
Which muscle type depends solely on sacroplasmic reticulum as it's calcium source
Skeletal muscle
Which muscles can contract without the need for nervous stimulation
Smooth and cardiac muscle
Which of the following correctly states the attachment points of the sternocleidomastoid from inferior to superior
Sternum clavicle and mastoid process
Based on its name describe the rectus femoris
Street in in the thigh
In skeletal muscle alternating light and dark bands are termed
Striations
Which term best describes the relationship of the deltoid and SITS muscles during shoulder abduction
Synergists
Which of the following is true concerning iso tonic eccentric contraction
The muscle lengthens but tension remains constant
Which of the following is true about slow twitch muscle fibers
They have abundant mitochondria in myoglobin
Which of the following activities would increase our muscles resistance to fatigue
Training for a marathon
Michael Jordan was are you a boy the best player in professional basketball history scientifically one would expect him to have highly developed
White muscle
In comparison to skeletal muscle, smooth muscle
contracts and relaxes more slowly
Muscle fibers are arranged in bundles called
fascicles