Myofibrils - Study guides, Class notes & Summaries

Which of the following is a recognized function of skeletal muscle? 1) A) guard body entrances and exits B) maintain posture C) maintain body temperature D) produce movement E) all of the above - Answer-E Nerves and blood vessels that service the muscle fibers are located in the connective tissues of the A) myofibrils. B) sarcolemma. C) endomysium. D) sarcomere. E) perimysium. - Answer-E Which of the following best describes the term sarcoplasmic reticulum? A) largely made of myosin...

CSCS Exam Practice Questions 2024, NSCA CSCS - Study Review Rated A+ Perimysium (surrounding group of fibers/fascicules) Endomysium (surrounding individual fibers) Fascia Delicate "cobwebby" tissue Motor Unit Motor Neuron and the muscle fibers it innervates Typically several hundred muscle fibers in a single motor unit Sarcolemma The plasma membrane of a cell Transverse Tubules Connect to plasma membrane to interior Action potentials travel through Ensures AP exci...

Which of the following is a recognized function of skeletal muscle? 1) A) guard body entrances and exits B) maintain posture C) maintain body temperature D) produce movement E) all of the above - ANSWER E Nerves and blood vessels that service the muscle fibers are located in the connective tissues of the A) myofibrils. B) sarcolemma. C) endomysium. D) sarcomere. E) perimysium. - ANSWER E Which of the following best describes the term sarcoplasmic reticulum? A) larg...

Bio 161 Exam 4 Latest Version Graded A+ Question 1: What is the term for an individual cell of a muscle? - a. muscle fiber - b. fascicle - c. myofibril - d. sarcolemma - Answer: a. muscle fiber Explanation: A muscle fiber refers to an individual cell of a muscle, containing multiple myofibrils. Question 2: What is the name given to a group of muscle cells within the belly of a muscle? - a. sarcolemma - b. sarcoplasm - c. fascicle 2 - d. myofibril - Answer:...

Actin - ️️A globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other contractile elements in cells The muscle tissue represents the greatest - ️️The greatest tissue mass in the body at around half of the bodys total weight. Thick filaments (myosin) - ️️Myosin myofilament with heads that bind to actin by reaching up and ratcheting forward About 300/filament The majority of muscles tissue is - ️️The ma...

What is the smallest level of organization in the body that contains the body's genetic information? Select one: a. chemical b. cellular c. tissue d. organism - Answer-B. Cellular The cellular level includes the nucleus, an organelle that contains the body's genetic information. Which is an example of a normally occurring positive-feedback mechanism? Select one: a. elevated blood pressure during exercise b. increase in heart rate after blood loss c. decrease in blood pressure a...

Osteoblasts ~ Primary bone-producing cells -young immature cell Osteocytes ~ Transformed osteoblasts that are surrounded by new bone tissue Osteoclasts ~ The major reabsorptive cells of the bone (breaks down bone) New bone is soft and hardens when it gets mineralized by _______ and _________ ~ calcium and phosphate Joints are also called _________ ~ articulations The functional units of muscle contractions are _________. They are made of _______ and ________ ~ Myofibrils; act...

Myocyte - ANSWER Muscle cell Sarcolemma - ANSWER Plasma membrane of myocyte Sarcoplasm - ANSWER Cytoplasm of myocyte Myofibril - ANSWER Tightly packed filament bundles found within skeletal muscle fibers. Contractional unit of a muscle cell. Sarcoplasmic reticulum - ANSWER Site of calcium storage in a muscle cell. Surrounds the myofibrils Transverse tubules (T-tubule) - ANSWER Inward extensions of the sarcolemma that dive into the muscle fiber and surround each myofibril to form a...

NURS 612 Exam 4 with Complete Solutions Osteoblasts Correct answer Primary bone-producing cells -young immature cell Osteocytes Correct answer Transformed osteoblasts that are surrounded by new bone tissue Osteoclasts Correct answer The major reabsorptive cells of the bone (breaks down bone) New bone is soft and hardens when it gets mineralized by _______ and _________ Correct answer calcium and phosphate Joints are also called _________ Correct answer articulations The functional un...

The Sliding Filament Mechanism - ️️- A sarcomere goes from z-line to z-line and has thick filaments (myosin) in the middle within the thin filaments (actin) on the sides - During contraction, the thin filaments move inwards over the thick filaments - When this happens, the z-lines move closer together - This occurs simultaneously along the entire fibre and all sarcomeres shorten to the same degree - Neither the length of the thin filaments or thick filaments themselves changes, just th...