TAMU KINE 433- Exam 2 Practice
Questions and Already Passed
Answers 2025-2026 Updated.
Skeletal Muscle - Answer -voluntary
-Regulated by the CNS
Cardiac/Smooth Muscle - Answer -involuntary
-regulated by the ANS
Muscle is composed of - Answer MANY muscle fibers
Muscle fibers vary in - Answer contractile properties
Muscle fibers range in diameter from - Answer 10mm-120mm
Muscle fibers are - Answer multinucleated
Sarcomere is the ____________ of a myofibril - Answer functional unit
Thick filaments are composed of - Answer myosin
Thin filaments are composed of - Answer -actin
-tropomyosin
-troponin
The intent to exercise arises in the _______ of the brain - Answer motor cortex
Central Command activates which things simultaneously? - Answer -muscle
-CV system
-respiratory system
, Motor Unit - Answer an alpha motor neuron and all the muscle fibers it innervates
An alpha motor neuron releases - Answer ACh, this turns an electrical signal to a chemical one
ACh binds to - Answer a nicotine receptor, turning a chemical signal to an electrical one
Action potentials travel down T tubules to - Answer the sarcoplasmic reticulum
The sarcoplasmic reticulum releases - Answer Ca++
Ca++ binds to - Answer troponin
Ca++ binding to troponin pulls tropomyosin off - Answer active sites
The powerstroke happens when - Answer myosin binds to actin and tilts
In a relaxed muscle fiber - Answer -intracellular Ca++ is low
-active site is blocked
-myosin cant bind actin
In a contracting muscle fiber - Answer -Ca++ is released from SR
-Ca++ binds troponin
-Active site is exposed
-Myosin head attaches
In a fully contracted muscle contraction - Answer -myosin head tilts
-ATP binds to myosin head
-Myosin head detaches
Muscle contraction stops when - Answer -central command is removed
-ACh degraded
Questions and Already Passed
Answers 2025-2026 Updated.
Skeletal Muscle - Answer -voluntary
-Regulated by the CNS
Cardiac/Smooth Muscle - Answer -involuntary
-regulated by the ANS
Muscle is composed of - Answer MANY muscle fibers
Muscle fibers vary in - Answer contractile properties
Muscle fibers range in diameter from - Answer 10mm-120mm
Muscle fibers are - Answer multinucleated
Sarcomere is the ____________ of a myofibril - Answer functional unit
Thick filaments are composed of - Answer myosin
Thin filaments are composed of - Answer -actin
-tropomyosin
-troponin
The intent to exercise arises in the _______ of the brain - Answer motor cortex
Central Command activates which things simultaneously? - Answer -muscle
-CV system
-respiratory system
, Motor Unit - Answer an alpha motor neuron and all the muscle fibers it innervates
An alpha motor neuron releases - Answer ACh, this turns an electrical signal to a chemical one
ACh binds to - Answer a nicotine receptor, turning a chemical signal to an electrical one
Action potentials travel down T tubules to - Answer the sarcoplasmic reticulum
The sarcoplasmic reticulum releases - Answer Ca++
Ca++ binds to - Answer troponin
Ca++ binding to troponin pulls tropomyosin off - Answer active sites
The powerstroke happens when - Answer myosin binds to actin and tilts
In a relaxed muscle fiber - Answer -intracellular Ca++ is low
-active site is blocked
-myosin cant bind actin
In a contracting muscle fiber - Answer -Ca++ is released from SR
-Ca++ binds troponin
-Active site is exposed
-Myosin head attaches
In a fully contracted muscle contraction - Answer -myosin head tilts
-ATP binds to myosin head
-Myosin head detaches
Muscle contraction stops when - Answer -central command is removed
-ACh degraded
