HHP 3114 Exam 2
Muscles that constrict or dilate to control blood flow are called
smooth muscle
Which of the following is also referred to as voluntary muscle?
skeletal Muscle
The type of muscle that is found in the walls of most internal organs
Smooth Muscle
The striated appearance of skeletal muscle fiber is mainly due to
the arrangement of the actin and myosin myofilaments
Which structure within the skeletal muscles stores and releases calcium?
Sarcoplasmic reticulum
Calcium ions, responsible for turning on muscle contraction, are
sarcoplasmic reticulum
A sarcomere
is the smallest functional unit of skeletal muscle, found between two z lines, and
contains actin and myosin
The smallest functional unit of a muscle is the
Sarcomere
The primary contractile proteins in the muscle are
actin and myosin
A single motor nerve and all of the muscle fibers that it supplies are referred to as
motor unit
What substance is released at the neuromuscular junction?
Acetylcholine
What is the trigger mechanism to initiate contraction in skeletal muscle?
calcium binding to troponin
The active binding sites to which myosin cross-bridges attach during muscle
contractions are found
on the actin filaments
Acetylcholine is