Portage A & P 1 Module 5 Exam Latest
Update (2024) Questions with Verified
Answers Graded A+
A motor signal is a signal that is sent from a muscle to the central nervous system. - Answer false,
that is sensory input
A person sustained a back injury to the muscle group closest to the spine. What muscle group was
injured? - Answer Spinalis
Acetylcholine is what type of substance? - Answer neurotransmitter
cardiac and smooth muscle tissue are both under involuntary control - Answer true
Contraction of (muscle) results in hip flexion - Answer iliacus
Describe how acetylcholine, sodium ions and calcium ions work together to enable a muscle contraction.
- Answer Acetylcholine is released from a motor nerve at the neuromuscular junction. Once
there, it binds with receptors on the muscle fiber that cause sodium ions to be released inside the cell.
This causes an action potential which reaches the sarcoplasmic recticulum. The sodium ions cause
calcium ions to be released from to sarcoplasmic recticulum. The calcium ions cause the muscle
contraction. The myosin heads grab the actin and pull them along causing a contraction.
During a muscle contraction which protein myofilament contains cross-bridges? - Answer myosin
External oblique - Answer fibers run down and forward
origin= sternum, ribs 5-12
insertion= linea alba, iliac crest
action= flexion of the spine, compress abdomen
flexes trunk to same side, rotates to opposite side
innervation: lower intercostal, ilioinguinal nerves
flexor digitorum superficialis action and innervation - Answer flexion of wrist and digits 2-5,
median nerve
Iliocostalis - Answer iliocostalis lumborum, iliocostalis thoracis, iliocostalis cervicis
Action= spine extension
Internal oblique - Answer fibers run upward and forward
origin= iliac crest, lumbodorsal fascia
Update (2024) Questions with Verified
Answers Graded A+
A motor signal is a signal that is sent from a muscle to the central nervous system. - Answer false,
that is sensory input
A person sustained a back injury to the muscle group closest to the spine. What muscle group was
injured? - Answer Spinalis
Acetylcholine is what type of substance? - Answer neurotransmitter
cardiac and smooth muscle tissue are both under involuntary control - Answer true
Contraction of (muscle) results in hip flexion - Answer iliacus
Describe how acetylcholine, sodium ions and calcium ions work together to enable a muscle contraction.
- Answer Acetylcholine is released from a motor nerve at the neuromuscular junction. Once
there, it binds with receptors on the muscle fiber that cause sodium ions to be released inside the cell.
This causes an action potential which reaches the sarcoplasmic recticulum. The sodium ions cause
calcium ions to be released from to sarcoplasmic recticulum. The calcium ions cause the muscle
contraction. The myosin heads grab the actin and pull them along causing a contraction.
During a muscle contraction which protein myofilament contains cross-bridges? - Answer myosin
External oblique - Answer fibers run down and forward
origin= sternum, ribs 5-12
insertion= linea alba, iliac crest
action= flexion of the spine, compress abdomen
flexes trunk to same side, rotates to opposite side
innervation: lower intercostal, ilioinguinal nerves
flexor digitorum superficialis action and innervation - Answer flexion of wrist and digits 2-5,
median nerve
Iliocostalis - Answer iliocostalis lumborum, iliocostalis thoracis, iliocostalis cervicis
Action= spine extension
Internal oblique - Answer fibers run upward and forward
origin= iliac crest, lumbodorsal fascia
