Clicker Review: Unit 4 Muscular System

Which of the following is not a function of the muscular system? Movement Thermogenesis Maintain posture Support joints All are functions

Muscle fibers are considered “excitable.” What does this mean? They can shorten & thicken They can produce electrical signals They can elongate without damaging the tissue The can return to their original position

Which of the following is not a difference between the 3 types of muscular tissue? Smooth & cardiac tissue contract involuntarily but skeletal tissue contracts voluntarily Smooth & cardiac tissue have 1 nucleus but skeletal tissue is multinucleated Smooth & cardiac muscle cells are joined by electrical junctions but skeletal muscle cells are joined by neuromuscular junctions Both 1 & 2 Statements #1-3 are true.

Muscle cells are called…? myofibrils myofilaments fibers sarcomeres

The immovable end of a muscle is called the …? Insertion Proximal tendon Distal tendon Origin

Muscles that contract and assist the prime mover are called… Agonists Synergists Antagonists Fixators

What is this called? perimysium epimysium endomysium Fasicle Fascia

What is this called? perimysium epimysium endomysium Fasicle Fascia

What is this called? perimysium epimysium endomysium Fasicle Fascia

What proteins make up the “thin” filaments? Myosin, actin, myofilaments Myosin, actin, troponin, tropomyosin Actin, troponin, tropomyosin troponin, tropomyosin

What is this synapse called? Motor endplate Chemical synapse Neuromuscular junction Neurotransmitter junction

What is this structure? Muscle fiber Sensory cell Motor neuron None of the above

What are the “purple circles?” vesicles neurotransmitters mitochondria Acetylcholine receptor sites

What is the functional unit of a muscle? Sarcomere Neuromusclualr junctions Muscle fibers Actin and myosin

When 1 neuron (nerve cell) sends a signal to 25 muscle fibers, this group is called a what? Nerve group Neurotransmitter cluster Motor unit

What makes up the red line? Actin Myosin Troponin Myofibril

The myofilaments have decreased in length to achieve contraction. TRUE FALSE

What causes Myosin to release from Actin? Troponin Tropomyosin ATP Calcium

What pulls the actin filaments inwards to shorten a muscle? Sarcomeres Myosin Sarcoplasmic reticulum T-tubule

When the nervous impulse stops, what happens? Tropomyosin is moved & uncovers the myosin binding sites Acetylcholine is released into the synaptic cleft ATP is no longer produced Calcium is pumped into the sarcoplasmic reticulum

What is the name of this muscle? Masseter Semitendonosous Zygomaticus Platysma Serratus anterior

What is the name of this muscle? Masseter Platysma Obicularis oris Buccinator Rectus femoris

What is the name of this muscle? Serratus anterior Rectus abdominus Vastus lateralis External abdominal oblique Gracilis

What is the name of this muscle? Soleus Gastrocnemius Vastus lateralis Sartorius Gracilis

What is the name of this muscle? Vastus medialis Semitendonosus Semimembranosus Biceps brachii Biceps femoris