d. Muscular contraction occurs by multiple cycles of cross-bridge activity. Shortening will continue as long as _______ is available and ______ is free to bind to troponin.…
5. Explain what happens to muscle force production at extremes of length (too short or too long). (Hint: Think about sarcomere structure and actin and myosin interactions)…
iii. body movement- Skeletal muscles, which attach to bones by tendons, use bones as levers to move the body and its parts.…
3. In this lab, what biological signal did we record? What was stimulated to elicit that recorded signal? Define threshold. What is the difference between threshold in a muscle versus that in a neuron? What is the relationship between the muscle threshold and the biological signal that was recorded?…
12. a. Name the sequence of events which converts a nerve signal into muscle contraction.…
_____3. Which type of tissue is responsible for contractions that allow movement of organs or the entire body? a) muscle tissue b) nervous tissue c) epithelial…
Post-lab Quiz Results You scored 60% by answering 3 out of 5 questions correctly. 1. When a skeletal muscle is stimulated and generates force but remains at a fixed length You correctly answered: d. the muscle is contracting isometrically. 2. Which protein is mostly responsible for the development of passive force in a muscle? You correctly answered: d. titin 3. In skeletal muscle, active force stimulated through a range of muscle lengths Your answer: c. will always be the dominant value contributing to the total force of the muscle. Correct answer: b. will utilize ATP hydrolysis to drive the cross bridge cycle. 4. Which if the following is not depicted in a typical skeletal muscle isometric length-tension curve? You correctly answered: a. time 5. Maximal active tension will be produced in a skeletal muscle fiber when Your…
2. If action potentials are an all or none response, how do we produce variable force of contraction in our skeletal muscles? List and describe the two (2) principal ways the central nervous system controls/varies the force of contraction of skeletal muscle. (4pts)…
D) Muscle Tissues account for most of the body mass of vertebrates. They consist of elongated cells that contract to generate forces that result in movement. Skeletal muscle is responsible for locomotion and other body movement.…
Topic 1 - Muscular System: Anatomy Review: Skeletal Muscle Tissue 1. Fill in the characteristics of the three muscle types: Muscle Type Cardiac Skeletal Smooth Shape of cell Branching Long, cylindrical Elongated # of nuclei Uninucleate Multinucleate Uninucleate Striations Yes Yes No Control Involuntary Voluntary Involuntary 2. What attaches muscles to bone? Tendons.…
Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You scored 20% by answering 1 out of 5 questions correctly. 1. Skeletal muscles are connected to bones by Your answer : c. ligaments. Correct answer: b. tendons. 2. Skeletal muscles are composed of hundreds to thousands of individual cells called Your answer : b. myofibrils. Correct answer: c. fibers. 3. The term motor unit refers to Your answer : b. all of the activated muscle fibers within one skeletal muscle. Correct answer: c. one motor neuron and all of the skeletal muscle fibers it innervates. 4. The motor neuron and muscle fiber intersect at what is called You correctly answered: d. the neuromuscular junction. 5. A twitch is Your answer : c. multiple contractile responses to a series of action potentials. Correct answer: a. one contractile response to a single action potential.…
14. Muscles general exhibit graded responses – what are two ways that muscle contraction can be graded.…
Match the following three terms with their definitions: Sarcolemma -plasma membrane of muscle cell Sarcoplasmic reticulum - plasma membrane of muscle cell Cytosol - intracellular fluid around organelles 6. Match the following three terms with their definitions: Terminal cisternae - part of sarcoplasmic reticulum—stores calcium ions T-tubules - part of sarcolemma—carries action potential Triad - T-tubule + 2 terminal cisternae 7. Myofibrils consist of contractile proteins called myofilaments. Name the two types and what they’re composed of: Thin filament composed of protein actin Thick filament composed of protein myosin 8.…
4. The stimulation of additional motor units will increase the strength of the contraction. This process is called ____recruitment____ _______________.…
Muscle Contraction is part of an organ in the body that is tensive. It may have a process of tensions that may be developed with muscle tissues. Contraction can be a meaning of shortening or long. Muscle Contraction can also produce a muscle cell that is for movement of the body. Myosin and Actin is an interaction protein to Muscle Contraction, it can be changed by shape but not by volume. Skeletal Muscle contraction is produce by heat. The muscles may receive signal from the brain. Once it receives signal it expands or contracts. Skeleton can provide muscle movement and frame work. This kind of muscle can be found attached your bones. Filaments there are only two types of sliding filaments. The Thick Filaments is called “Myofliaments”. Myofliaments produces myosin. Myosin is a protein and can be found in muscle tissue that makes a thick filament. A filament called actin forms a contract with Sarcomeres of skeletal muscle. With the Sarcomere, actin and myosin slides across each other for shortening of a muscle fiber. The thin filaments is called “actin” is a muscle protein. Actin is pulled by Myosin to cause a contact to a muscle. Actin sometimes forms bacteria to use for motility. The Roles of ATP is a shorten term of actin and myosin filament. ATP is a sort of fuel to give to the muscle during contractions; this type of energy is to make the muscle move.…