Hondros Bio 253 UPDATED ACTUAL
Exam Questions and 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
Frontal lobe - CORRECT ANSWER - Reasoning, planning, parts of speech, movements,
emotions, and problem solving
Exam Questions and 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
Frontal lobe - CORRECT ANSWER - Reasoning, planning, parts of speech, movements,
emotions, and problem solving
