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WorksheetsExam 3 CH09 and CH10 - A&P1, SP26
Total questions: 40
Worksheet time: 20mins
What is the resting membrane potential of a typical neuron?
+30 mV
0 mV
-70 mV
+70 mV
During which phase of the action potential are potassium ions (K+) primarily moving out of the neuron?
Depolarization
Repolarization
Hyperpolarization
Threshold phase
According to the sliding filament theory, what happens to the sarcomere length during muscle contraction?
It remains the same.
It increases.
It decreases.
It doubles.
What is the primary function of the myelin sheath?
To receive signals from other neurons
To generate action potentials
To speed up the transmission of electrical signals along the axon
To store neurotransmitters
What happens when an action potential reaches the axon terminal of a neuron?
It immediately triggers another action potential in the next neuron
It causes the axon to split into two
It leads to the release of neurotransmitters into the synaptic cleft
It results in the neuron returning to its resting membrane potential
How does the binding of calcium to troponin affect muscle contraction?
It inhibits the contraction mechanism.
It has no effect on muscle contraction.
It promotes the detachment of myosin from actin.
It facilitates the interaction between actin and myosin.
What is the role of the sarcoplasmic reticulum in excitation-contraction coupling?
It depolarizes the sarcolemma.
It stores and releases calcium ions.
It synthesizes neurotransmitters.
It conducts the action potential to the T-tubules.
Which facial muscle is used to pucker the lips, as in whistling?
Temporalis
Orbicularis oris
Platysma
Levator labii superioris
Which muscle is primarily responsible for extending the knee?
Biceps femoris
Semimembranosus
Vastus lateralis
Tibialis anterior
What part of the neuron receives signals from other neurons?
Axon
Dendrites
Cell body
Myelin sheath
What is the role of ATP in the detachment phase of the cross bridge cycle?
It binds to actin, causing detachment.
It is broken down to ADP and Pi to energize the myosin head.
It binds to myosin, causing the myosin head to detach from actin.
It increases calcium ion concentration, leading to detachment.
Which muscle group is involved in hip flexion?
Hamstrings
Quadriceps
Iliopsoas
Gluteus maximus
What role does ATP play in muscle contraction according to the sliding filament theory?
It breaks the bond between actin and myosin, allowing muscle relaxation.
It provides the energy for the power stroke that moves myosin along actin.
It increases the calcium ion concentration within the muscle cell.
It acts as a neurotransmitter to initiate muscle contraction.
What is the primary energy source used by the sodium-potassium pump to transport ions across the cell membrane?
Glucose
ATP
ADP
GTP
Which ion's movement is primarily responsible for the depolarization phase of an action potential?
Sodium (Na+)
Potassium (K+)
Calcium (Ca2+)
Chloride (Cl-)
Which proteins are primarily involved in the sliding filament theory of muscle contraction?
Collagen and elastin
Myosin and collagen
Actin and myosin
Keratin and actin
What is the threshold potential typically around for an action potential to be triggered?
-55 mV
-70 mV
0 mV
+30 mV
What initiates the cross bridge cycle in muscle contraction?
Binding of ATP to myosin
Release of calcium ions
Depolarization of the sarcolemma
Binding of myosin to actin
What is the insertion of the deltoid muscle?
What is the main role of neurotransmitters in synaptic transmission?
To create the resting membrane potential
To depolarize the presynaptic neuron
To carry the electrical signal across the synaptic cleft
To bind to receptors on the postsynaptic neuron, influencing its activity
What is the main function of the sodium-potassium pump in nerve cells?
To generate action potentials
To synthesize neurotransmitters
To maintain the resting membrane potential
To promote the diffusion of ions
Which muscle of the shoulder is primarily responsible for abduction of the arm?
Deltoid
Supraspinatus
Infraspinatus
Teres minor
What is the role of the rotator cuff muscles in shoulder movement?
Primarily responsible for the flexion and extension of the arm
Responsible for the internal and external rotation of the arm
They stabilize the shoulder joint
They are not involved in shoulder movement
What type of muscle contraction is involved when lowering a book back onto a table?
Isometric
Isotonic concentric
Isotonic eccentric
Isokinetic
What is the primary action of the triceps brachii?
Flexion of the forearm
Extension of the forearm
Adduction of the arm
Abduction of the arm
How many sodium ions (Na+) are typically exchanged for potassium ions (K+) during one cycle of the sodium-potassium pump?
2 Na+ for 3 K+
3 Na+ for 2 K+
1 Na+ for 1 K+
4 Na+ for 2 K+
What is the origin of the semimembranosus muscle?
Which of the following abdominal muscles has fibers that run horizontally?
Which of the following would be controlled by a somatic neuron?
Heart rate
Digestion
Jumping jack
Hormone secretion
Which of the following is NOT a hamstring muscle?
Semimembranousus
Semitendonosus
Biceps Femoris
Rectus Femoris
This energy pathway breaks down glucose to make ATP and is anaerobic.
Which of the following is a characteristic of a Type 2 muscle fiber?
Which of the following is the thin filament?
Troponin
Titin
This explains why when a muscle or sarcomere is stretched, it cannot produce maximal tension/force
The length-tension relationship
This muscle produces the major movement made during inhalation
When a skeletal muscle contracts to cause a given movement, the relatively stationary end of attachment of the muscle is termed this:
Knowing that muscles are often named for their anatomical location, the brachialis, coracobrachialis and brachioradialis would all be found in this region:
Leg
Abdomen
Arm
Thigh
The action of the biceps brachii muscle pulling on the radius to flex the elbow and elevate the hand is an example of this kind of lever:
This action is accomplished by the erector spinae muscles:
Vertebral column flexion and rotation
Vertebral column extension and posture maintenance
This muscle creates flexion at both the shoulder and the elbow:
Deltoid
Brachialis
