BIOL 2401 Lone Star College -Biology 2401 - Lecture Exam
3 Questions | 2026/2027 | Answers Correct | With Complete
Solutions
Utricle, Saccule & Semicircular Canals (Functions)
Maintain balance with hair cells bending according to fluid &
otolith (stones) movement. Bend one way & small amounts of
neurotransmitter are released, bend the other way & large
amounts of neurotransmitter are released
Eye Wall (3 Layers)
Sclera - Outer
Choroid- Middle
Retina - Inner
Components that light must pass through to form an image in
the brain:
Cornea
Aqueous humor
Pupil
Lens
Vitreous Body
Retina
Optic Nerve
Optic Casium
LGN of Thalamus
Occiptial Lobe
Six eye muscles
,Superior Rectus (top)
Lateral Rectus (outward)
Superior Oblique (Downward & outward)
Medial Rectus (Inward)
Inferior Oblique (upward & outward)
Inferior Rectus (downward)
Rods
Detect objects in dim light & produce black/white images
Cones
Found in the fovea & function in bright light to produce color,
images - 3 types: red, blue, green
Neuron Structure
Reticular formation
,Found in the brainstem, pons and promotes sleep, consciousness
and habituation. Also Cardiovascular control & pain path
signals.
Medulla Oblongata
Functions are respirator and heart rhythms, sleep/wake; damage
can cause death
Cerebellum
Functions are movement, 3D positions, damage causes slow and
uncoordinated. Individuals with cerebellar lesions tend to sway
and stagger when walking
Pons
, Functions are relay for information exchange between
cerebellum & cerebrum
Midbrain
Superior Collicul - Visual input
Inferior Collicul - Audio input, startle reflex, loud bangs
Forebrain
1. Diencephalon: Thalamus, hypothalamus, Epthalumus
2. Telencephalon
Thalamus
Master switching center of sensory info
3 Questions | 2026/2027 | Answers Correct | With Complete
Solutions
Utricle, Saccule & Semicircular Canals (Functions)
Maintain balance with hair cells bending according to fluid &
otolith (stones) movement. Bend one way & small amounts of
neurotransmitter are released, bend the other way & large
amounts of neurotransmitter are released
Eye Wall (3 Layers)
Sclera - Outer
Choroid- Middle
Retina - Inner
Components that light must pass through to form an image in
the brain:
Cornea
Aqueous humor
Pupil
Lens
Vitreous Body
Retina
Optic Nerve
Optic Casium
LGN of Thalamus
Occiptial Lobe
Six eye muscles
,Superior Rectus (top)
Lateral Rectus (outward)
Superior Oblique (Downward & outward)
Medial Rectus (Inward)
Inferior Oblique (upward & outward)
Inferior Rectus (downward)
Rods
Detect objects in dim light & produce black/white images
Cones
Found in the fovea & function in bright light to produce color,
images - 3 types: red, blue, green
Neuron Structure
Reticular formation
,Found in the brainstem, pons and promotes sleep, consciousness
and habituation. Also Cardiovascular control & pain path
signals.
Medulla Oblongata
Functions are respirator and heart rhythms, sleep/wake; damage
can cause death
Cerebellum
Functions are movement, 3D positions, damage causes slow and
uncoordinated. Individuals with cerebellar lesions tend to sway
and stagger when walking
Pons
, Functions are relay for information exchange between
cerebellum & cerebrum
Midbrain
Superior Collicul - Visual input
Inferior Collicul - Audio input, startle reflex, loud bangs
Forebrain
1. Diencephalon: Thalamus, hypothalamus, Epthalumus
2. Telencephalon
Thalamus
Master switching center of sensory info
