Anatomy help pleaseeeeeeeeee!!!!!!!!!!

[moonlight123]

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Hi all, I'm stuck with a few questions, please help me if you could, thank you very much !!!!

1) All of the following move the vertebral column except:

1) longissimus dorsi
b) external oblique
c) rectus abdominis
d) longissimus thoracis
e) quadratus lumborum

2) Which one of the following DOES NOT affect the force of a muscle contraction?

a) oxygen availability
b) nutrient availability
c) amount of fiber stretch before contraction
d) diameter of the thick filaments
e) frequency of stimulation

3) Regeneration of muscle tissue:

a) occurs only in skeletal muscle tissue
b) does not occur in cardiac muscle tissue
c) is stimulated by acetylcholine
d) cannot occur in smooth muscle tissue
e) can occur in all types of muscle tissue

4) The speed of nerve impulse conduction is:
a) faster when a myelin sheath is absent
b) faster when the axon diameter is larger (I Guess this one is the answer but not sure)
c) slower when an axon is warmed
d) faster when the stimulus is stronger
e) slower when saltatory conduction is utilized

5) Građe potential:
a) are useful only for short distance communication
b) are initiated at electrical synapses
c) occur most often in axons and less often in dendrites
d) always make the membrane more polarized
e) are action potentials that are variable (građe) in magnitude

6) Which of the following is not a type of muscle contraction:
a) multiple motor unit summation
b) Treppe
c) isotonic
d) isometric
e) incomplete tetanus

 

[BeatrixKiddo]

;4431833]Hi all, I'm stuck with a few questions, please help me if you could, thank you very much !!!!

1) All of the following move the vertebral column except:

1) longissimus dorsi
b) external oblique
c) rectus abdominis
d) longissimus thoracis Um, never heard of this muscle, and I thought I knew them alle) quadratus lumborum

2) Which one of the following DOES NOT affect the force of a muscle contraction?

a) oxygen availability
b) nutrient availability
c) amount of fiber stretch before contraction
d) diameter of the thick filaments
e) frequency of stimulation Isn't it that action potentials aren't additive

3) Regeneration of muscle tissue:

a) occurs only in skeletal muscle tissue
b) does not occur in cardiac muscle tissue
c) is stimulated by acetylcholine
d) cannot occur in smooth muscle tissue
e) can occur in all types of muscle tissue

4) The speed of nerve impulse conduction is:
a) faster when a myelin sheath is absent- oppisite actually
b) faster when the axon diameter is larger (I Guess this one is the answer but not sure) Never heard of this concept
c) slower when an axon is warmed um, NO
d) faster when the stimulus is stronger doubt it
e) slower when saltatory conduction is utilized false

5) Građed potential:
a) are useful only for short distance communication- nope
b) are initiated at electrical synapses--um dont think so
c) occur most often in axons and less often in dendrites nope
d) always make the membrane more polarized ---no
e) are action potentials that are variable (građe) in magnitude seems to be the obvious choice, but who knows, depends on your professor i guess

6) Which of the following is not a type of muscle contraction:
a) multiple motor unit summation
b) Treppe
c) isotonic- i'd guess this one, this really isn't anatomy you know.
d) isometric
e) incomplete tetanus

 

[DDSY]

Why don't you ask the Dent/Med forum? I'm sure they've studied anatomy/physiology extensively

 

[H2OPOLODENT]

4: B. Aside from mylenation axon diameter is the major factor in the speed of conduction.

6: Definitely NOT C or D. A and E are both relevant terminology in muscle physiology, but I'm not sure if these are contraction "types."

 

[t man]

2. AP's can be summated... it's called tetanus, baby. therefore e is true. not that i know the correct answer or anything... but diameter of thick filaments doesn't look right to me,

 

[BeatrixKiddo]

2. AP's can be summated... it's called tetanus, baby. therefore e is true. not that i know the correct answer or anything... but diameter of thick filaments doesn't look right to me,

Isn't tetanus like inhibition of neurotransmitter release.. and action potentials are either on or off, they can't be summated.

 

[dent1021]

2. AP's can be summated... it's called tetanus, baby. therefore e is true. not that i know the correct answer or anything... but diameter of thick filaments doesn't look right to me,

NO, AP's cannot summate. Tetanus refers to single muscle twitches 'stacking up'. The muscle contracts further b/c AP's are generated faster than the muscle can relax.

PS- that question is really stupid.

 

[BeatrixKiddo]

NO, AP's cannot summate. Tetanus refers to single muscle twitches 'stacking up'. The muscle contracts further b/c AP's are generated faster than the muscle can relax.

PS- that question is really stupid.

YES! I'm right. I'm right i'm right WOOHOOOOO

 

[moonlight123]

thank you very very muchhhhhhhh all !!!!

I don't know why my professor made it so difficult ...