BMD 251 (A&P I) Exam 3 Study Guide – Step-by-Step Guidance

Study Guide - Smart Notes

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Q1. What suture divides the skull parietal and occipital bones posteriorly?

Background

Topic: Axial Skeleton – Cranial Sutures

This question tests your knowledge of the major sutures of the skull, specifically their locations and the bones they separate.

Key Terms:

Suture: An immovable joint between skull bones.
Parietal bones: Paired bones forming the sides and roof of the cranium.
Occipital bone: Bone forming the posterior part of the skull base.

Step-by-Step Guidance

Recall the four major cranial sutures: coronal, sagittal, squamous, and lambdoid.
Identify which bones each suture separates. For example, the coronal suture separates the frontal and parietal bones.
Focus on the posterior aspect of the skull, where the parietal and occipital bones meet.
Determine which suture is located between the parietal bones and the occipital bone.

Try solving on your own before revealing the answer!

Q2. Which of the following makes up part of the eye orbit?

Background

Topic: Skull Anatomy – Bones of the Orbit

This question tests your ability to identify which bones contribute to the structure of the eye orbit.

Key Terms:

Orbit: The bony cavity containing the eyeball.
Facial bones: Bones that form the structure of the face, some of which contribute to the orbit.

Step-by-Step Guidance

Recall the seven bones that form the orbit: frontal, sphenoid, zygomatic, maxilla, palatine, lacrimal, and ethmoid.
Review the options and determine which are part of this group.
Eliminate bones that are not part of the orbit, such as those forming the jaw or nasal septum.

Try solving on your own before revealing the answer!

Q3. The alveolar margin is part of the:

Background

Topic: Facial Bones – Bone Markings

This question tests your knowledge of specific bone markings and their locations, particularly where teeth anchor in the jaw.

Key Terms:

Alveolar margin: The ridge containing the sockets (alveoli) for teeth.
Mandible: Lower jaw bone.
Maxilla: Upper jaw bone.

Step-by-Step Guidance

Recall which bones have alveolar margins (both upper and lower jaws).
Consider the options and identify which bone forms the lower jaw and contains tooth sockets.
Eliminate bones that do not have alveolar margins.

Try solving on your own before revealing the answer!

Q4. The vertebral pedicles and laminae make up the:

Background

Topic: Vertebral Anatomy

This question tests your understanding of vertebral structure, specifically the parts that form the vertebral arch.

Key Terms:

Pedicle: Short, thick process that projects from the back of the vertebral body.
Lamina: Flattened or arched part of the vertebral arch, forming the roof of the spinal canal.
Vertebral arch: Structure formed by pedicles and laminae, enclosing the spinal cord.

Step-by-Step Guidance

Review the basic structure of a vertebra: body, arch, processes.
Identify which parts (pedicles and laminae) contribute to the vertebral arch.
Match the description to the correct anatomical term among the options.

Try solving on your own before revealing the answer!

Q5. Which vertebra would demonstrate an odontoid process?

Background

Topic: Vertebral Column – Cervical Vertebrae

This question tests your knowledge of unique features of cervical vertebrae, specifically the odontoid process (dens).

Key Terms:

Odontoid process (dens): Peg-like projection from the body of a specific cervical vertebra.
Axis (C2): The second cervical vertebra, which has the dens.

Step-by-Step Guidance

Recall which cervical vertebrae are called the atlas (C1) and axis (C2).
Identify which one has the odontoid process and its function (pivot for head rotation).
Eliminate vertebrae that do not have this feature (e.g., thoracic, sacral).

Try solving on your own before revealing the answer!

Q6. Which of the following would indicate a lumbar vertebra?

Background

Topic: Vertebral Column – Lumbar Vertebrae

This question tests your ability to recognize distinguishing features of lumbar vertebrae.

Key Terms:

Lumbar vertebrae: Lower back vertebrae, typically larger and more robust.
Spinous process: Posterior projection from the vertebral arch; shape varies by region.

Step-by-Step Guidance

Recall the general characteristics of lumbar vertebrae (size, shape of spinous process).
Compare the options to features unique to lumbar vertebrae, such as a hatchet-shaped spinous process.
Eliminate features that belong to other vertebral regions (e.g., vertebra prominens is C7).

Try solving on your own before revealing the answer!

Q7. Raising the leg posteriorly (decreasing the angle) is an example of:

Background

Topic: Joint Movements

This question tests your understanding of anatomical terms for joint movements, specifically those involving the hip.

Key Terms:

Flexion: Decreasing the angle between two bones, usually in the sagittal plane.
Extension: Increasing the angle between two bones.
Abduction/Adduction: Movement away from/toward the midline.

Step-by-Step Guidance

Visualize the movement described: raising the leg backward at the hip joint.
Recall which movement decreases the angle at the joint in the posterior direction.
Match the movement to the correct anatomical term among the options.

Try solving on your own before revealing the answer!

Q8. The joint between skull bone sutures is classified structurally/functionally as:

Background

Topic: Joint Classification

This question tests your knowledge of how joints are classified by structure (fibrous, cartilaginous, synovial) and function (synarthrotic, amphiarthrotic, diarthrotic).

Key Terms:

Fibrous joint: Bones joined by dense connective tissue, no joint cavity.
Synarthrotic: Immovable joint.
Suture: Type of fibrous joint found in the skull.

Step-by-Step Guidance

Recall the structural and functional classification of sutures.
Match the correct structural (fibrous) and functional (synarthrotic) terms to the joint type.
Eliminate options that do not fit both criteria.

Try solving on your own before revealing the answer!

Q9. A synchondroses would be found between:

Background

Topic: Cartilaginous Joints

This question tests your understanding of the types and locations of cartilaginous joints, specifically synchondroses.

Key Terms:

Synchondrosis: A cartilaginous joint where bones are united by hyaline cartilage.
Examples: Epiphyseal plates, first rib and sternum.

Step-by-Step Guidance

Recall the definition and examples of synchondroses.
Review the options and identify which joint is formed by hyaline cartilage.
Eliminate joints that are not synchondroses (e.g., those formed by fibrocartilage or fibrous tissue).

Try solving on your own before revealing the answer!

Q10. Which of the following is the only multiaxial joint?

Background

Topic: Synovial Joint Types

This question tests your knowledge of the types of synovial joints and their range of motion.

Key Terms:

Multiaxial joint: A joint that allows movement in three planes (e.g., shoulder, hip).
Ball-and-socket joint: Example of a multiaxial joint.

Step-by-Step Guidance

Recall the six types of synovial joints and their axes of movement.
Identify which joint type allows movement in all three anatomical planes.
Match the correct joint type to the definition of multiaxial.

Try solving on your own before revealing the answer!

Q11. What knee joint structure helps prevent medial/lateral rotation when the leg is extended?

Background

Topic: Knee Joint Anatomy

This question tests your understanding of the ligaments and structures that stabilize the knee joint.

Key Terms:

Tibial collateral ligament (medial collateral ligament): Ligament on the inner side of the knee.
Medial/lateral rotation: Rotational movements of the leg at the knee.

Step-by-Step Guidance

Recall the main ligaments of the knee: ACL, PCL, MCL (tibial collateral), LCL (fibular collateral), menisci.
Identify which ligament specifically resists medial/lateral rotation when the knee is extended.
Eliminate ligaments that primarily prevent anterior/posterior displacement.

Try solving on your own before revealing the answer!

Q12. What muscle tissue capability is described by forcible muscle shortening?

Background

Topic: Muscle Tissue Properties

This question tests your knowledge of the four main properties of muscle tissue.

Key Terms:

Contractility: Ability of muscle to shorten forcibly when stimulated.
Excitability: Ability to receive and respond to stimuli.
Extensibility: Ability to be stretched.
Elasticity: Ability to recoil to resting length.

Step-by-Step Guidance

Recall the four properties of muscle tissue and their definitions.
Identify which property specifically refers to muscle shortening.
Match the correct property to the description in the question.

Try solving on your own before revealing the answer!

Q13. What dense outer connective tissue covering surrounds the entire muscle?

Background

Topic: Muscle Structure – Connective Tissue Coverings

This question tests your knowledge of the three connective tissue layers associated with muscle.

Key Terms:

Epimysium: Dense connective tissue surrounding the entire muscle.
Perimysium: Surrounds muscle fascicles (bundles of fibers).
Endomysium: Surrounds individual muscle fibers.

Step-by-Step Guidance

Recall the three connective tissue layers and what each surrounds.
Identify which layer is the outermost and encloses the entire muscle.
Match the correct term to the description in the question.

Try solving on your own before revealing the answer!

Q14. What change must occur to cause membrane depolarization?

Background

Topic: Muscle Physiology – Membrane Potentials

This question tests your understanding of the events that initiate depolarization in muscle fibers.

Key Terms:

Depolarization: Reduction in membrane potential, making the inside less negative.
Sodium channels: Ion channels that open to allow Na+ influx, causing depolarization.

Step-by-Step Guidance

Recall the resting membrane potential and what ions are involved.
Identify which ion movement initiates depolarization (Na+ influx).
Match the correct channel opening to the process of depolarization.

Try solving on your own before revealing the answer!

Q15. Where does acetylcholine bind to its membrane receptor at the neuromuscular junction?

Background

Topic: Neuromuscular Junction

This question tests your knowledge of the structure and function of the neuromuscular junction, specifically where neurotransmitter binding occurs.

Key Terms:

Acetylcholine (ACh): Neurotransmitter released by motor neurons.
Motor end plate: Specialized region of the muscle fiber's sarcolemma at the neuromuscular junction.

Step-by-Step Guidance

Recall the structure of the neuromuscular junction: axon terminal, synaptic cleft, motor end plate.
Identify where ACh receptors are located on the muscle fiber.
Match the correct anatomical site to the description in the question.