TEST 2 MIDTERM

Muscle Attachment Points

  • Muscle attachment terminology:

    • Synergist: Helps the prime mover in a muscle action.

    • Prime mover: The primary muscle responsible for a specific movement.

    • Insertion: The point where the muscle attaches to the bone that moves.

    • Origin: The point where the muscle attaches to the stationary bone.

Creatine Phosphate

  • Definition: Creatine phosphate serves as an energy source for muscle contraction.

  • Functionality:

    • Is stored within muscle cells, providing a quick reserve of energy.

    • Produces one ATP molecule during energy transfer.

  • Myth clarification: It does NOT inactivate acetylcholine, nor does it store energy within the sarcoplasmic reticulum.

Anaerobic Metabolism in Muscles

  • Process: When muscles burn glucose anaerobically, the following occurs:

    • Oxygen is NOT produced as a waste product.

    • Muscle contraction can still occur.

    • ATP is indeed produced, albeit less efficient than aerobic respiration.

    • Lactic Acid Accumulation: As a byproduct, lactic acid builds up, contributing to muscle fatigue.

Muscles of the Anterior Thigh

  • Identifying muscle groups:

    • Muscles extend from the pelvic bone to the distal fibula.

    • These muscles are essential for leg movement.

    • Examples include:

    • Biceps femoris

    • Semitendinosus

  • Function: Extend the leg at the knee joint.

Neuroanatomy: Synapses

  • Definition: The space between the axon of one neuron and the dendrite of another is known as the synapse.

  • Other terms:

    • Cell body: Contains the nucleus and organelles of the neuron.

    • Vesicle: Holds neurotransmitters that are released into the synapse.

    • Node of Ranvier: Gaps in the myelin sheath of an axon that facilitate rapid signal transmission.

Somatosensory Areas

  • Anatomical division: The primary somatosensory area and the primary motor area of the brain are separated by the central sulcus.

  • Significance: Areas involved in processing sensory information (somatosensory) and executing motor commands (motor area).

Neurological Disorders and Conditions

  • Endorphins:

    • Function: Natural morphine-like substances secreted by the choroid plexus that function to reduce pain and enhance feelings of well-being.

  • Consequences of neurodegeneration: Certain conditions can lead to disorders such as:

    • Parkinson's disease

    • Hypertension

    • Blindness

    • Respiratory depression

Brain Adaptability

  • Neuroplasticity: Refers to the brain’s ability to change and adapt in response to experiences, environment, and thoughts.

    • Clarification: It indicates the brain is not static and can modify its structure and functioning.

  • Contrasts:

    • Not limited to fixed regions or modules; rather, it shows interconnected functionality across different parts.

Joint Anatomy

  • MCP Joints: The metacarpophalangeal joints, commonly referred to as the knuckles, allow for significant movement of the fingers and are located at the proximal area of the fingers relative to the wrist.

Human Body Organization Levels

  • Simplest organizational unit: The cell represents the most basic level of human body organization, serving as a foundational building block.

  • Hierarchy: Higher levels include tissues, organs, and organ systems.

End of Notes