Biology Chapter 6 - Lower Body

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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?

Ball and socket joint Signup and view all the answers

What is the function of the sternum?

Protects the heart and lungs Signup and view all the answers

What is the main function of bursae in joints?

To reduce friction between bones Signup and view all the answers

What is the weakest bone in the lower leg?

Fibula Signup and view all the answers

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

Hinge joint Signup and view all the answers

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

Rotation Signup and view all the answers

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

Xiphoid process Signup and view all the answers

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

Amphiarthrotic joint Signup and view all the answers

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

Synovial fluid Signup and view all the answers

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

Flexion Signup and view all the answers

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

Adduction Signup and view all the answers

How many skeletal muscles are present in the human body?

640 Signup and view all the answers

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

Insertion Signup and view all the answers

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

To generate heat Signup and view all the answers

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

To carry the impulse inside the muscle cell to the sarcoplasmic reticulum Signup and view all the answers

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

By being broken down by enzymes Signup and view all the answers

What is the function of acetylcholine in muscle contraction?

To bind to receptors on the muscle membrane, generating an impulse Signup and view all the answers

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

To allow myosin to attach to actin, producing muscle contraction Signup and view all the answers

What is a motor unit?

A motor neuron and the muscle fibers it stimulates Signup and view all the answers

What is the function of the perimysium in a muscle?

Covering of a fascicle Signup and view all the answers

What is the functional unit of a myofibril?

Sarcomere Signup and view all the answers

What is the role of myosin in muscle contraction?

Pulling actin towards the center of the sarcomere Signup and view all the answers