Muscular Roles & Anatomy
This term describes the main moving muscle that is primarily responsible for producing a specific movement?
What is the agonist
This structure is responsible for the automatic reflex of turning your head immediately when you hear a sudden noise behind you
What is the superior colliculus?
This colored muscular ring acts as a reflexive shutter to adjust the size of the pupil and regulate how much light enters the eye.
What is the iris?
This cartilage flap performs the critical task of sealing off the larynx during swallowing to keep food and liquids out of the airway.
What is the epiglottis?
If a nerve injury completely paralyzes a patient's orbicularis oculi, they will physically struggle to perform this basic facial action.
What is closing the eye?
This type of muscle opposes or reverses a particular movement, such as the triceps brachii relaxing while the biceps brachii flexes the arm.
What is the antagonist?
This deep bridge of nerve fibers is essential for coordinating communication and sharing data between the left and right hemispheres of the brain.
What is the corpus collosum?
This specialized region of the retina provides the sharpest color vision and highest visual acuity because it contains exclusively cones.
What is the fovea centralis?
This asymmetry in human anatomy leaves room for the heart to sit comfortably inside the thoracic cavity
Why is the left lung smaller?
During a vertical jump, this large muscle located on the posterior lower leg serves as the primary agonist to plantar flex the foot.
what is gastrocnemius?
This point of skeletal muscle attachment moves toward the stationary origin point during a muscle contraction
What is the insertion?
This specific subdivision of the nervous system regulates involuntary visceral functions like heartbeat and digestion to maintain homeostasis while you sleep.
What is the autonomic nervous system?
This structural zone lacks photoreceptors entirely because it is the exit point where the optic nerve leaves the eyeball.
What is the optic disc (or blind spot)?
The extreme thinness of this structural barrier allows oxygen and carbon dioxide to rapidly diffuse between the blood and air.
If the chest wall is punctured and unsealed, a contracting diaphragm cannot pull air into the lung because this key factor cannot be established.
What is pressure gradient?
These two helper muscle roles are responsible for stabilizing a joint and guiding movement so the prime mover can do its job safely.
What are fixators and synergists?
This specific region of the cerebrum handles high-level cognitive functions, such as weighing the pros and cons of two different choices
What is the frontal lobe?
When an object moves close to your face, these internal eye muscles contract to make the lens more convex so you can focus
This functional zone is responsible for cleaning, warming, and humidifying air before it ever reaches the sites of gas exchange.
What is the conducting zone?
While performing a standard sit-up, this dynamic lateral pair of abdominal muscles works in tandem to flex your vertebral column.
What are the internal and external obliques?
Characterized by its long, strap-like appearance, this specific muscle has the unique ability to flex, abduct, and laterally rotate the hip.
What is the sartorius?
If a patient suffers an injury to the medulla oblongata within the brainstem, which critical bodily function is immediately threatened?
What are the vital autonomic functions?
If this specific extrinsic eye muscle becomes paralyzed, the individual will struggle to look downward and laterally.
What is the superior oblique muscle?
This chronic respiratory disease results in the physical destruction of alveolar walls, crippling gas exchange efficiency and altering lung capacities
What is the emphysema?
If a patient attempts to lift a heavy weight when their synergists and fixators are paralyzed, the primary muscle fails because this occurs at the joint.
What is joint instability?