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Anatomy and Physiology
Articulations, Nerves, and Muscle
36
Anatomy
Undergraduate 2
06/22/2013

Additional Anatomy Flashcards

 


 

Cards

Term
3 types of articulations
Definition

Synarthrosis,

Amphiarthrosis,

Diarthrosis.

Term
Synarthrosis
Definition
No movement.
Example: Sutures on skull, articulation between the sternum and the ribs
Term
Amphiarthrosis
Definition

Little movement.

Example: Pubic symphysis, and the joint between the tibia and the fibula.

Term
Diarthrosis
Definition

Free movement. 

Example: Upper and lower limbs

Term
Synovial fluid
Definition

Surrounds joints

Lubrication

      Nutrient distribution to condrocytes

  Shock absorption

Term
What happens when cartilage is damaged?
Definition
Pain and stiffness
Term
Bursa
Definition
pocket containing synovial fluid
Term
Characteristics of articular cartilage
Definition

No perichondrium

Smooth

Contains synovial fluid.

 

 

Term
Synovial structure
Definition

Articular cartilage

Synovial fluid

Joint capsule

 

Term
Muscle tissue functions
Definition

Move skeleton

 Maintain posture

 Support soft tissues

 Guard entrances

 Maintain body temperature

 Provide nutrient reserves

Term
Tendons
Definition
collagen fibers that attach muscle to bone
Term
Fascicle
Definition

bundle of muscle fibers surrounded by perimesium

Term
Myofibril
Definition

made up of actin and myosin

Term
Myofilament structure
Definition

Zone of overlap: where thin and thick filaments overlap

  Z lines: zigzag line going down

A band: thick filaments

I band: thin filaments

  M line: center line of thick filaments

  H band: thick filaments not overlapping with thin

Term
Muscle cells have lots of nuclei so...
Definition
...they can repair more easily
Term
Sarcomere
Definition
Functional unit of myofilament
Term
Muscle cells
Definition
Striated, multinucleate
Term
Triad
Definition

T-tubule + terminal cisternae 

Term
Contraction
Definition
Myosin forms a cross-bridge with actin
Term
# of myofibrils in a muscle cell
Definition
100's-1,000's
Term
What reveals the active site on actin?
Definition
tropomyosin
Term
What happens to the SR when an action potential occurs
Definition
Calcium is released
Term
Neuromuscular junction
Definition
lies between a muscle and a nerve
Term
What happens to Ca. when muscles relax?
Definition
It moves into terminal cisternae
Term
What makes a membrane depolarize/stimulate
Definition
positively charged ions
Term
Steps of contraction
Definition

Calcium ions arrive

     Active site is exposed and Ca. binds to troponin

      Cross bridge formation: Myosin binds to Actin

    Myosin pivots in a power stroke

    Cross bridge detachment

 Myosin reactivation

Term
Aerobic vs Anaerobic
Definition

Aerobic requires O and makes 17 ATP

Anaerobic aka glycolysis doesnt require O, makes 2 ATP

Term
Peripheral Nervous System
Definition

includes all neural tissue outside the CNS

Term
3 Nervous Systems
Definition

Sympathetic = fight/flight

Parasympathetic= digestion, urination

Somatic = voluntary body movement

 

Term
Types of neurons
Definition

Anoxonic- in brain.

    Bipolar- in sense organs. Small, has cell body in center

   Unipolar- cell body lies to one side of the center. In PNS

Multipolar- Control skeletal muscles. Cell body at one end

Term
What neurons are found in the Peripheral Nervous System?
Definition
Unipolar neurons
Term
Parts of a nerve
Definition

Cell body- contains nucleus

    Dendrite- where information is received

Axon- long part

Axon Hillock-base of axon, near body

Telodendria- end of axon

Synaptic Terminals- End of Telodendria. Communicates with other cells

Term
The peripheral Nervous System carries what information?
Definition
Sensory and motor
Term
Blood-Brain Barrer
Definition
Isolates the CNS from chemicals in the blood
Term
3 Channel Types
Definition

Mechanical = Respond to physical distortion of membrane. Important for sensory receptors

Chemical = produce graded potentials. Found on dendrites and cell bodies of neurons

Voltage = Transmembrane potential. Sodium and potassium channels

Term
3 Graded Potential Changes
Definition

Depolarization- Transmembrane potential increases from resting potential

Repolarization- Decreasing back to resting membrane potential

Hyperpolarization- Decreasing past resting membrane potential 

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