Biology Chapter 6 - Lower Body
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Questions and Answers

What is the function of the talus bone?

  • Provides balance during walking
  • Supports the entire weight of the body with each step (correct)
  • Forms after birth as movement rubs the tendon over the knee joint
  • Attaches to the fibula

Which type of joint allows for no movement?

  • Metatarsal joints
  • Synarthrocic joints (correct)
  • Diarthrocic joints
  • Amphiarthrocic joints

How many pairs of true ribs are there in the ribcage?

  • 12 pairs
  • 5 pairs
  • 10 pairs
  • 7 pairs (correct)

What type of joint has a rounded end of one bone that fits into a cup-like structure on another bone?

<p>Ball and socket joint (C)</p> Signup and view all the answers

What is the function of the sternum?

<p>Protects the heart and lungs (B)</p> Signup and view all the answers

What is the main function of bursae in joints?

<p>To reduce friction between bones (D)</p> Signup and view all the answers

What is the weakest bone in the lower leg?

<p>Fibula (D)</p> Signup and view all the answers

Which type of diarthrocic joint is characterized by angular movement in one plane?

<p>Hinge joint (B)</p> Signup and view all the answers

What type of movement is characterized by a bone rotating on another bone?

<p>Rotation (A)</p> Signup and view all the answers

What is the name of the process at the bottom of the sternum?

<p>Xiphoid process (B)</p> Signup and view all the answers

What is the type of joint that has a fibrocartilage pad between bones?

<p>Amphiarthrotic joint (A)</p> Signup and view all the answers

What is the name of the fluid secreted by the inner membrane of the synovial joint?

<p>Synovial fluid (D)</p> Signup and view all the answers

What type of motion involves a decrease in the angle between the bones of a joint?

<p>Flexion (D)</p> Signup and view all the answers

What is the term for the movement of a body part towards the midline of the body?

<p>Adduction (A)</p> Signup and view all the answers

How many skeletal muscles are present in the human body?

<p>640 (B)</p> Signup and view all the answers

What is the term for the part of a muscle attached to a movable bone?

<p>Insertion (D)</p> Signup and view all the answers

What is the purpose of muscle contraction in regulating body temperature?

<p>To generate heat (D)</p> Signup and view all the answers

What is the role of T-tubules in muscle contraction?

<p>To carry the impulse inside the muscle cell to the sarcoplasmic reticulum (C)</p> Signup and view all the answers

What is the process by which acetylcholine is removed from the synapse?

<p>By being broken down by enzymes (C)</p> Signup and view all the answers

What is the function of acetylcholine in muscle contraction?

<p>To bind to receptors on the muscle membrane, generating an impulse (C)</p> Signup and view all the answers

What is the role of Ca++ ions in muscle contraction?

<p>To allow myosin to attach to actin, producing muscle contraction (A)</p> Signup and view all the answers

What is a motor unit?

<p>A motor neuron and the muscle fibers it stimulates (B)</p> Signup and view all the answers

What is the function of the perimysium in a muscle?

<p>Covering of a fascicle (A)</p> Signup and view all the answers

What is the functional unit of a myofibril?

<p>Sarcomere (B)</p> Signup and view all the answers

What is the role of myosin in muscle contraction?

<p>Pulling actin towards the center of the sarcomere (B)</p> Signup and view all the answers

What is the site of muscle contraction?

<p>Sarcomere (D)</p> Signup and view all the answers

What is the purpose of the endomysium?

<p>Covering of a muscle cell (B)</p> Signup and view all the answers

What is the function of acetylcholine in the neuromuscular junction?

<p>Stimulating muscle contraction (D)</p> Signup and view all the answers

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