HONDROS BIO 253 EXAM QUESTIONS
& ACTUAL CORRECT ANSWERS
Layers of the skin - CORRECT ANSWER epidermis, dermis, hypodermis
Stratum Corneum - CORRECT ANSWER Protective durable overcoat, waterproof, tough,
relatively insensitive to biological, chemical and physical assault.
Stratum Lucidum - CORRECT ANSWER visible only in thick skin, few layers thick, dead clear cells
Stratum Granulosum - CORRECT ANSWER 3-5 layers of thick keratinocytes flastten out
Stratum Spinosum - CORRECT ANSWER overlies the stratum basale, cells come from the basale,
filaments u the cells that resist tension, keratinocytes have a spiny appearance, contain
langerhen cells
Stratum Basale - CORRECT ANSWER Deepest layer, single row if renewing keratinocytes that are
getting ready to push up, melaninocytes, small portion of merkel cells
Parts of a neuron - CORRECT ANSWER Cell body, Dendrites, Axon
Cell body - CORRECT ANSWER Provide protein for maintaining and regenerating nerves
Dendrites - CORRECT ANSWER Each neuron had one or more dendrites, branch from the cell
body, bring impulses in, distal ends of dendrites of sensory neurons are receptors
, Axon - CORRECT ANSWER Each neurons has one axon, axon hillock integrates incoming signals.
axons carry impulses away and communicates
Afferent neurons - CORRECT ANSWER Brings signal to CNS, *sensory
Efferent neurons - CORRECT ANSWER Carry signals away, *motor
Reflex Arc - CORRECT ANSWER Receptor, afferent, interneuron, efferent, effector, response
Membrane potential - CORRECT ANSWER Slight deficiency of positively charged ions on the
inside of the membrane
Saltatory conduction - CORRECT ANSWER In myelinated fibers, action potentials in the
membrane occor only at the nodes of Raniver
Continuous conduction - CORRECT ANSWER In unmyelinated fibers
Acetylcholine - CORRECT ANSWER chemical structure, found in junctions with motor effectors
(skeletal muscles, glands, many parts of the brain
Brain stem - CORRECT ANSWER Medulla oblongata, pons, midbrain
Diencephalon - CORRECT ANSWER Hypothalamus, Thalamus
Cerebellum - CORRECT ANSWER Compares motor commands of cerebrum with proprioceptor
information, acts with cerebral cortex to produce skilled movements, controls balance and
posture
& ACTUAL CORRECT ANSWERS
Layers of the skin - CORRECT ANSWER epidermis, dermis, hypodermis
Stratum Corneum - CORRECT ANSWER Protective durable overcoat, waterproof, tough,
relatively insensitive to biological, chemical and physical assault.
Stratum Lucidum - CORRECT ANSWER visible only in thick skin, few layers thick, dead clear cells
Stratum Granulosum - CORRECT ANSWER 3-5 layers of thick keratinocytes flastten out
Stratum Spinosum - CORRECT ANSWER overlies the stratum basale, cells come from the basale,
filaments u the cells that resist tension, keratinocytes have a spiny appearance, contain
langerhen cells
Stratum Basale - CORRECT ANSWER Deepest layer, single row if renewing keratinocytes that are
getting ready to push up, melaninocytes, small portion of merkel cells
Parts of a neuron - CORRECT ANSWER Cell body, Dendrites, Axon
Cell body - CORRECT ANSWER Provide protein for maintaining and regenerating nerves
Dendrites - CORRECT ANSWER Each neuron had one or more dendrites, branch from the cell
body, bring impulses in, distal ends of dendrites of sensory neurons are receptors
, Axon - CORRECT ANSWER Each neurons has one axon, axon hillock integrates incoming signals.
axons carry impulses away and communicates
Afferent neurons - CORRECT ANSWER Brings signal to CNS, *sensory
Efferent neurons - CORRECT ANSWER Carry signals away, *motor
Reflex Arc - CORRECT ANSWER Receptor, afferent, interneuron, efferent, effector, response
Membrane potential - CORRECT ANSWER Slight deficiency of positively charged ions on the
inside of the membrane
Saltatory conduction - CORRECT ANSWER In myelinated fibers, action potentials in the
membrane occor only at the nodes of Raniver
Continuous conduction - CORRECT ANSWER In unmyelinated fibers
Acetylcholine - CORRECT ANSWER chemical structure, found in junctions with motor effectors
(skeletal muscles, glands, many parts of the brain
Brain stem - CORRECT ANSWER Medulla oblongata, pons, midbrain
Diencephalon - CORRECT ANSWER Hypothalamus, Thalamus
Cerebellum - CORRECT ANSWER Compares motor commands of cerebrum with proprioceptor
information, acts with cerebral cortex to produce skilled movements, controls balance and
posture
