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