During cross-bridge cycling, the __________ positions the myosin head into high-energy state. a. ATP hydrolysis b. ATP attachment c. ATP synthesis d. a and b e. b and c

Q: The sliding filament mechanism describes the process during which: a. actin and myosin slide…

A: The muscles of the body serves main role in the movement of the body parts such as legs, arms and…

Q: In muscle contraction, when nervous stimulation ___, it causes Ca2+ to be ___ the sarcoplasmic…

A: The muscle contraction is depends on the interaction of actin (thin filament) and myosin (thick…

Q: When a skeletal muscle cell contracts and the muscle shortens,

A: During muscle contraction, some myosin heads bind to actin (forming crossbridges) while others…

Q: 18. Malathion interferes with the enzyme cholinesterase (found synaptic clefts). When Malathion is…

A: A broad-spectrum insecticide from the chemical family organophosphates used in public recreation…

Q: Which item is biggest? A. myosin head B. myofibril C. troponin D. sarcomere

A: Muscles are compact structures made up of highly tensile , strong, long, multinucleated cells called…

Q: Movement of sarcomeres is dependent upon the motor protein, to and moving along Select one: a.…

A: Introduction  The basic unit of contractility in a myocyte is called a sarcomere. Thick myosin…

Q: Which region of the sarcomere does not change length between muscle relaxation and muscle…

A: Muscle is a kind of tissue as it is made up of group of cells. It is one of the four kind of primary…

Q: 8. Assuming two skeletal muscle fibers have the same myosin ATPase activity, and both are producing…

A: Isotonic contraction :- During isotonic contraction of muscle, same tension maintained while the…

Q: At low intracellular Ca2+ concentration, _________________ the active sites on the thin actin…

A: Muscular system is one of the body system which aids in contraction and relaxation of muscle so that…

Q: Which of the following statements about the microscopic structure of smooth muscle fibers is…

A: Muscles have a vital role in the body. Muscles do a lot for our bodies as well. They circulate blood…

Q: Which of the following structures is not found in the head region of the thick filament myosin?

A: Myosin is a protein found in muscle tissue. It is a motor protein, takes part in muscle contraction.…

Q: What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation?…

A: Muscle contraction is the activation and formation of tension sites with muscle fibres, while muscle…

Q: Which of the following is true?   A. Muscle fibers either will contract with all the force…

A: Introduction: Muscles are the soft tissues present in all mammals. The muscle cells comprise protein…

Q: For relaxation to occur, A. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium…

A: The muscle contraction and relaxation are regulated by the concentration of calcium ions released…

Q: Muscles generate heat. Which muscle type is responsible for generating most of the heat in the body?…

A: "Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Movement of sarcomeres is dependent upon the motor protein ______ attached to and moving along…

A: The smallest functional unit of a striated muscle tissue is called a sarcomere. The muscle fiber is…

Q: . Injection of C. botulinum toxin (Botox)______ . a. causes irreversible muscle contraction b.…

A: The most common side effects of C.botulinum toxin are pain, swelling, or bruising at the injection…

Q: What is released when myosin heads attach to actin filaments A. Phosphate B. ATP C. ADP D.…

A: Myosin and actin filaments are two proteins that help muscles contract. Myosin is a motor protein…

Q: When sarcomeres contract during muscle contraction, which of the following occurs?   A. The myosin…

A: Sarcomeres contract during muscle contraction.

Q: The actin myosin bond is broken by the attachment of A. Tropomyosin B. Phosphate C. ATP D. ADP

A: Myosin and actin filaments are two types of proteins involved in muscle contraction. Myosin is a…

Q: Which of the following is the site of calcium ion storage within muscles? a. T tubules b.…

A: Muscles are the body tissues that are principally accountable for causing movement in the body.…

Q: Which of the following is true concerning the role of Calcium in the contraction of muscle- cells?…

A: A muscle is a smooth tissue in animals. On the basis of structure, contractile properties and…

Q: Which of the following thin filament structures directly interacts with the myosin heads to form a…

A: The mechanism of contraction of skeletal muscle was best explained through - "sliding filament…

Q: During which phase of the crossbridge cycle is ATP split into ADP and Pi? A. Immediately preceding…

A: Cross bridge cycling refers specifically to the action of the cross-bridge, that being the head and…

Q: At low intracellular Ca2+ concentration, _________________ the active sites on the thin actin…

A: Muscle system is a type of body system which in which muscle undergo regular contraction and…

Q: During muscle contraction, the I band a. hides the H zone. b. shortens or narrows. c. overlaps the Z…

A: SARCOMERE It is the complicated unit of striated muscle tissue. It is the repeating unit between two…

Q: 32. Which of the following structures is not found in the head region of the thick filament myosin?…

A: The cytoskeletal proteins responsible for the lengthening and shortening of the muscle fibers are…

Q: The firmness of rigor mortis ___.     A. can be reduced by manipulation of the affected muscles and…

A: Normally the muscles of the body remain in the contracted state until ATP binds to myosin, releasing…

Q: With regard to muscle contraction, which of the following is an INCORRECT statement with regard to…

A: The muscle cells contain a striped pattern or striations which is formed by a series of basic units…

Q: The action potential of skeletal muscle                 A. is not essential for contraction.…

A: Skeletal muscle fibers are cylindrical, multinucleated, striated, and under voluntary control.

Q: When ADP and Pi are bound to myosin in the cross-bridge cycle... (MULTIPLE SELECT) A. There is no…

A: The cross-bridge cycle of muscle contraction is the process in which the actin filament and myosin…

Q: The actual contractile units of muscle, called _____, extend from middle of one _____ to middle of…

A: Muscles are referred to as the soft tissue of the body, contraction, and relaxation of the muscle is…

Q: During muscle contraction, binding sites for myosin are uncovered by the movement of A. Tropomysin…

A: A. Tropomyosin   During muscle contraction, the binding sites for myosin on the actin filament are…

Q: 17. Which of the following properties of the structure of skeletal muscle is not true?   A.…

A: The skeletal muscles or voluntary muscles are attached to bones and are involved in locomotion.

Q: Which protein shields the myosin-binding site, preventing contraction from happening at rest? D a.…

A: Muscles constitute a set of specialized set of connective tissues which along with the bones plays…