AP1 M5 exam Flashcards
(True or False) There are three types of muscle tissue found in the body.
True
(True or False) Smooth and cardiac muscle tissue are both under voluntary control.
False
(True or False) The musculocutaneous nerve is part of the central nervous system.
False
(True or False) A motor signal is a signal that is sent from a muscle to the central nervous system.
False
(True or False) The cervical plexus contains nerves that innervate the thigh.
False
Ligaments connect which types of tissue?
Connect bone to bone
Acetylcholine is what type of substance?
Neurotransmitter
What must occur for a muscle contraction to stop?
Calcium ions must be pumped back into the sarcoplasmic reticulum
During a muscle contraction which protein myofilament is pulled along?
Actin
What is the name of the thick myofilament?
Myosin
(options only A-?) Your patient sustained an injury to their facial nerve (CN VII). Which actions would be impaired?
B. Compress cheeks
C. Grin/grimace
This was the appriate option not that includes all actions involved
A person sustained a back injury to the muscle group closest to the spine. What muscle group was injured?
Spinalis
Your patient is having difficulty when asked to bring his chin to his chest. He is also having difficulty turning his face from side to side. What muscle is most likely impaired?
Sternocleidomastoid
When a muscle contracts, the M lines within a sarcomere come closer together towards the Z line
True
(True or False) The A band contains thin filaments.
True
Which muscle contracts to enable the main effort required to stand on your toes?
Gastrocnemius
When rectus femoris contracts, which bone is pulled anteriorly by this muscle?
Tibia
When extensor digitorum contracts, what action(s) occurs?
B. Wrist extension
D. Extension of digits 2-5
Contraction of ________ results in _________?
psoas major, hip flexion
When superior gemellus contracts, what action(s) will not occur at the hip?
B. Internal rotation
E. Flexion
Which muscle has origins on both the clavicle and scapula?
- A (Deltoid)
Which muscle is innervated by the thoracodorsal nerve?
Lats
Describe what is meant by muscle fiber “cross-bridges”. What occurs to enable movement of the cross-bridges?
In the presence of calcium ions, portions of a myosin filament called cross-bridges bend backward and attach to an actin filament. After attaching to the actin filament, the cross-bridges bend forward, and the actin filament is pulled along. The cross-bridges attach and detach some fifty to 100 times as the thin filaments are pulled to the center of a sarcomere. ATP is needed on a cellular level for the myosin to pull actin along.
