38 Questions
Which type of muscle tissue can undergo mitosis and regeneration?
Smooth muscle
What is the main characteristic of skeletal muscle contraction?
Can only contract fully
What type of muscle tissue is controlled by the autonomic nervous system?
Both cardiac and smooth muscle
Which type of muscle tissue has intercalated discs for cell-to-cell junctions?
Cardiac muscle
What is the main function of satellite cells in skeletal muscle?
To aid recovery
Which type of muscle tissue has a single central nucleus?
Both cardiac and smooth muscle
What type of muscle tissue is found in the walls of hollow organs?
Smooth muscle
What is the main characteristic of cardiac muscle contraction?
Fast, all-or-none contraction
What type of muscle tissue has striation due to the dense arrangement of actin and myosin?
Skeletal muscle
What is the role of calcium in muscle contraction?
It binds to Tropin, deforming tropomyosin
What happens when an action potential opens in a muscle cell?
Calcium floods into the cell
Which statement is true regarding rigor mortis?
It occurs due to a lack of ATP
Which of the following neuron types does not have dendrites at its perikaryon?
Unipolar neuron
Which structural component of a neuron is primarily responsible for receiving nerve impulses?
Dendrites
Which of the following correctly describes the action of myosin during muscle contraction?
Myosin heads bind to actin when tropomyosin is deformed
Where are the presynaptic terminals located in a multipolar neuron?
At the distal end of the axon
What occurs when calcium unbinds from Tropin during muscle relaxation?
Actin and myosin are blocked from interacting
What is the primary function of the sarcoplasmic reticulum in muscle cells?
Storing and releasing calcium
Where are the perikaryon and dendrites located in a bipolar neuron?
One end has dendrites, while perikaryon is in the middle
What is the primary function of intercalated discs in cardiac muscle tissue?
To allow for coordinated contraction
What is unique about the nucleus of skeletal muscle cells?
It is multi-nucleated
What is the main difference between cardiac and skeletal muscle contraction?
Cardiac muscle contraction is all or none
What type of muscle tissue has gap junctions for cell-to-cell communication?
Smooth muscle
What is the primary function of autonomic innervation in smooth muscle tissue?
To allow for automatic contraction and relaxation
What is the primary function of satellite cells in skeletal muscle?
To aid in muscle recovery
Which type of muscle tissue is voluntary?
Skeletal muscle
What is the primary difference between skeletal and cardiac muscle structure?
Skeletal muscle is multinucleated
What is the primary characteristic of smooth muscle contraction?
It is slow and partial
Which statement accurately describes the role of the sarcoplasmic reticulum during muscle contraction?
It stores calcium ions needed for muscle contractions.
What happens to the myosin heads during contraction?
They bind to actin filaments and pull them inward.
What is the primary function of Troponin in skeletal muscle contraction?
It deforms tropomyosin allowing myosin to bind to actin.
Which mechanism causes muscle contraction to cease?
Closure of action potentials stopping calcium influx.
What results from calcium binding to Troponin during skeletal muscle contraction?
Tropomyosin is deformed, allowing myosin to bind.
What distinguishes a pseudo-unipolar neuron from other neuron types?
It has a perikaryon in the middle of its axon.
Which event characterizes rigor mortis at a molecular level?
Lack of ATP leading to persistent myosin-actin binding.
What happens when calcium unbinds from Troponin after a muscle contraction?
Actin binding sites are once again covered by tropomyosin.
What differentiates a bipolar neuron from a multipolar neuron?
Presynaptic terminals are located at one end with the perikaryon in the center in bipolar neurons.
What triggers the release of calcium ions from the sarcoplasmic reticulum during muscle contraction?
Initiation of an action potential in the muscle fiber.
Learn about the qualities and characteristics of muscle tissue, including skeletal muscles, their structure, and functions.
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