Portage A & P 1 Module 5 Exam |Comprehensive Practice Test| Questions & Expertly Verified Answers, 2025 | 2026.

Portage A & P 1 Module 5 Exam |Comprehensive Practice Test| Questions & Expertly Verified Answers, 2025 | 2026. Quiz_________________? A motor signal is a signal that is sent from a muscle to the central nervous system. - Answer false, that is sensory input Quiz_________________? A person sustained a back injury to the muscle group closest to the spine. What muscle group was injured? - Answer Spinalis Quiz_________________? Acetylcholine is what type of substance? - Answer neurotransmitter Quiz_________________? cardiac and smooth muscle tissue are both under involuntary control - Answer true Quiz_________________? Contraction of (muscle) results in hip flexion - Answer iliacus Quiz_________________? 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. Quiz_________________? During a muscle contraction which protein myofilament contains cross-bridges? - Answer myosin Quiz_________________? 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