Human Anatomy Muscle Quiz

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Questions and Answers

Which muscle is primarily responsible for hip abduction?

M.psoas major

M.quadriceps femoris

M.gluteus medius (correct)

M.gluteus maximus

What is one function of the M.gastrocnemius muscle?

It performs hip flexion

It adducts the arm

It flexes the leg (correct)

It causes knee extension

Which statement is correct regarding the M.pectoralis major?

It adducts the arm (correct)

It pulls the scapula downward

It primarily causes hip extension

It assists in ankle dorsi flexion

Which muscle is known as the 'boxer muscle'?

M.serratus anterior Signup and view all the answers

What is the primary action of the M.tibialis anterior?

Dorsiflexion of the ankle Signup and view all the answers

Which type of joints are known as non-synovial joints?

Both B and C Signup and view all the answers

What is the primary characteristic of synovial joints?

Full mobility supported by an articular capsule Signup and view all the answers

What type of movement is defined as bending a limb?

Flexion Signup and view all the answers

Which axis extends from the right or left side of the body and is parallel to the ground?

Frontal Axis Signup and view all the answers

What is the primary action of supination?

Drinking position with palm facing forward Signup and view all the answers

Which movement is described as taking a limb away from the midline?

Abduction Signup and view all the answers

What defines inversion in foot movement?

Soles of the feet face each other medially Signup and view all the answers

What movement is associated with external rotation of the forearm?

Supination Signup and view all the answers

What is myology the study of?

Muscles Signup and view all the answers

Which muscle is known as the vaccine muscle?

M.deltoideus Signup and view all the answers

What type of muscle contraction occurs without any change in muscle length?

Isometric contraction Signup and view all the answers

Which muscle is responsible for flexion and supination of the forearm?

M.biceps brachii Signup and view all the answers

Which of the following muscles is the strongest flexor of the thigh?

M.iliopsoas Signup and view all the answers

How are muscles typically named?

By their shape, location, and function Signup and view all the answers

What are motor units composed of?

One motor neuron and all muscle cells it innervates Signup and view all the answers

What is the function of skeletal muscles except?

Hormone production Signup and view all the answers

Study Notes

Joints and Muscles

Joints connect bones, enabling movement.
Muscles contract to produce movement.
Joints are classified according to their ability to move.

Joint Classification

Fibrous joints: Immovable; bones connect directly. Examples include sutures in the skull.
Cartilaginous joints: Slightly movable; bones are connected by cartilage. Examples include the ribs.
Synovial joints: Freely movable; bones separated by a fluid-filled joint cavity. Examples include the knee and shoulder.

Synovial Joint Structure

Articular capsule: Surrounds the joint.
Synovial membrane: Lines the joint cavity, secreting synovial fluid.
Articular cartilage: Covers the ends of bones, reducing friction.
Ligaments: Connect bones, reinforcing the joint.

Angular Movements

Flexion: Decreases the angle between two bones.
Extension: Increases the angle between two bones.
Hyperextension: Extension beyond the normal range.

Other Movements

Abduction: Movement away from the midline.
Adduction: Movement towards the midline.
Rotation: Movement around a central axis.
Lateral flexion: Bends the body sideways.
Circumduction: Circular movement of a limb.

Supination and Pronation

Supination: Palm faces anteriorly or upward.
Pronation: Palm faces posteriorly or downward.

Inversion and Eversion

Inversion: Sole of the foot turns inward.
Eversion: Sole of the foot turns outward.

Muscle Types

Skeletal muscle: Voluntary movement.
Cardiac muscle: Heart.
Smooth muscle: Involuntary movement.

Muscle Functions

Produce movement.
Generate heat.
Stabilize posture.

Naming Muscles

Named according to shape, size, location, or function; number of heads.

Muscle Contraction

Origin: Muscle attachment at stationary bone.
Insertion: Muscle attachment at moving bone.
Isometric contraction: Muscle contracts but doesn't change length.
Isotonic contraction: Muscle contracts, changing length.

Motor Unit

A motor neuron and all muscle cells innervated by it are a motor unit.
All motor units do not need to contract at once for movement to occur.

Facial Muscles

These muscles originate from bone or fascia and insert into the skin.
These muscles are collective called facial or mimic muscles
Facial muscles allow for facial expressions
They are innervated by the facial nerve.

Shoulder Girdle Muscles (e.g., Deltoid)

Muscles that connect the upper limb to the axial skeleton.
Involved in arm movement, such as abduction and flexion.

Other Muscle Groups and Regions

Brachial region (e.g., Biceps brachii): Flexion and supination of the forearm.
Triceps brachii: Extension of the forearm.
Hip region (e.g., Iliopsoas): Flexion of the thigh.
Glutes (e.g., Gluteus maximus): Extension, abduction and lateral rotation of the thigh.
Femoral region (e.g., Quadriceps femoris): Extension of the knee.
Crural region (e.g., Tibialis anterior): Dorsiflexion of the ankle.
Thoracic region (e.g., Pectoralis major): Adduction and medial rotation of the arm.

Diaphragm

The main muscle for breathing.
Contracts during inspiration, increasing thoracic volume.

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Description

Test your knowledge on human anatomy with this quiz focused on muscle functions, types of joints, and movements. Explore key muscles such as the gastrocnemius and pectoralis major, and learn about the intricacies of muscle contraction and joint types.