Bio250 Exam Questions with Accurate Solutions
which of the following best describes a muscle twitch? - ANSWER the smallest
possible contraction
a muscle that is acting as a synergist during a joint action may do which of the following? -
ANSWER -contract together with the prime mover to produce more power
-stabilize a joint to restrict undesirable movements of a bone
-modify the direction of the movement produced by the prime mover
because myofilaments side across each other during contraction, the mechanism of
muscle contraction is called___________filament model. - ANSWER sliding
what is a muscle fascicle? - ANSWER a bundle of muscle fibers surrounded by connective tissue
during flexion, the triceps brachii acts as a(n) ________of the biceps brachii and brachialias
muscles because it opposes the action - ANSWER antagonist
what is a Motor unit? - ANSWER a single motor neuron and all of the muscle fibers it controls
what are the actions of the gluteus Maximus? - ANSWER -extends hip joint
-abducts thigh
the_______reticulum serves as a reservoir for calcium ions in skeletal muscle cells - ANSWER
sarcoplasmic
what is the major action of the gastrocnemius muscle? - ANSWER plantar flexion of the foot
,the pectoralis major moves the humerus in multiple ways. select 3 of these actions from the
list below. - ANSWER -adducts arm
-flexes shoulder
-medially rotates arm
how many heads does biceps brachii have? - ANSWER 2
which of the following are mechanisms that muscle cells use to generate ATP? - ANSWER -
anaerobic fermentation
-aerobic respiration
calf muscle - ANSWER Gastrocnemius
delts - ANSWER deltoid
six pack - ANSWER rectus abdominis
pecs - ANSWER pectoralis major
which term refers to the process in which muscle fibers develop tension and may shorten? -
ANSWER contraction
walls of the heart consists of______ muscle - ANSWER cardiac
the portion of a myofibril from one Z disc to the next is called a(n) - ANSWER sarcomere
which of the following best defines muscle tone? - ANSWER -the state of partial contraction
found in resting muscles
, connective tissue structures that attach bone to muscle are called - ANSWER tendons
what is the action of the zygomaticus major and minor muscles? - ANSWER elevate angle of
mouth
what are other names for skeletal muscle? - ANSWER -voluntary
-striated
the plasma membrane of a skeletal muscle cell is called the - ANSWER sarcolemma
what type of contraction involves the development of tension but no change in length?
- ANSWER isometric
how many heads does the quadriceps femoris have? - ANSWER 4
put the following events In order that they happen during muscle fiber excitation. start with the
release of ACh into the synaptic cleft. - ANSWER -ACh is released into the synaptic cleft
-ACh diffuses across the cleft and binds to ACh receptors on the surface of the muscle
cell -ion channels open in the activated ACh receptors
-Na+ enters the muscle cell and K+ leaves the muscle cell through the open ion channels
-The movement of the charged ions across the sarcolemma electrically excites the muscle cell
what is a common action of all the rotator cuff muscles? - ANSWER help prevent slippage of the
humeral head in the glenoid fossa
bundles of muscle fibers within a muscle are called - ANSWER fascicles
which of the following best describes a muscle twitch? - ANSWER the smallest
possible contraction
a muscle that is acting as a synergist during a joint action may do which of the following? -
ANSWER -contract together with the prime mover to produce more power
-stabilize a joint to restrict undesirable movements of a bone
-modify the direction of the movement produced by the prime mover
because myofilaments side across each other during contraction, the mechanism of
muscle contraction is called___________filament model. - ANSWER sliding
what is a muscle fascicle? - ANSWER a bundle of muscle fibers surrounded by connective tissue
during flexion, the triceps brachii acts as a(n) ________of the biceps brachii and brachialias
muscles because it opposes the action - ANSWER antagonist
what is a Motor unit? - ANSWER a single motor neuron and all of the muscle fibers it controls
what are the actions of the gluteus Maximus? - ANSWER -extends hip joint
-abducts thigh
the_______reticulum serves as a reservoir for calcium ions in skeletal muscle cells - ANSWER
sarcoplasmic
what is the major action of the gastrocnemius muscle? - ANSWER plantar flexion of the foot
,the pectoralis major moves the humerus in multiple ways. select 3 of these actions from the
list below. - ANSWER -adducts arm
-flexes shoulder
-medially rotates arm
how many heads does biceps brachii have? - ANSWER 2
which of the following are mechanisms that muscle cells use to generate ATP? - ANSWER -
anaerobic fermentation
-aerobic respiration
calf muscle - ANSWER Gastrocnemius
delts - ANSWER deltoid
six pack - ANSWER rectus abdominis
pecs - ANSWER pectoralis major
which term refers to the process in which muscle fibers develop tension and may shorten? -
ANSWER contraction
walls of the heart consists of______ muscle - ANSWER cardiac
the portion of a myofibril from one Z disc to the next is called a(n) - ANSWER sarcomere
which of the following best defines muscle tone? - ANSWER -the state of partial contraction
found in resting muscles
, connective tissue structures that attach bone to muscle are called - ANSWER tendons
what is the action of the zygomaticus major and minor muscles? - ANSWER elevate angle of
mouth
what are other names for skeletal muscle? - ANSWER -voluntary
-striated
the plasma membrane of a skeletal muscle cell is called the - ANSWER sarcolemma
what type of contraction involves the development of tension but no change in length?
- ANSWER isometric
how many heads does the quadriceps femoris have? - ANSWER 4
put the following events In order that they happen during muscle fiber excitation. start with the
release of ACh into the synaptic cleft. - ANSWER -ACh is released into the synaptic cleft
-ACh diffuses across the cleft and binds to ACh receptors on the surface of the muscle
cell -ion channels open in the activated ACh receptors
-Na+ enters the muscle cell and K+ leaves the muscle cell through the open ion channels
-The movement of the charged ions across the sarcolemma electrically excites the muscle cell
what is a common action of all the rotator cuff muscles? - ANSWER help prevent slippage of the
humeral head in the glenoid fossa
bundles of muscle fibers within a muscle are called - ANSWER fascicles
