Lab 13 - The Muscular System Objectives Checklist-Afler completing this lab, you

Question

Lab 13 - The Muscular System Objectives Checklist-Afler completing this lab, you should be able to: describe the general functions of the muscular system and the general characteristics of muscle tissue [Pre-lab activities A2-3] distinguish between the three types of muscle tissue based on appearance, location, and control [Pre-lab activity B; lab activity Al] define, explain, and apply the terms origin, insertion, and belly [Lab activities B3-4] explain the role of agonists, antagonists, fixators, and synergists in joint movement and stability [Lab activities B2-3, B5-6] identify the muscles of the face, trunk and limbs and specify movements for which they are responsible [Pre-lab activities C1- 8: lab activities DI-81 D D D 0 Pre-Lab Activities A. INTRODUCTION TO MUSCULAR SYSTEM AND ITS FUNCTIONS 1. Fill in the blank The organs of the muscular system aetha connect muscles to bones organ system and that carry out the main functions of this that connect muscles to bones. 2. The functions of the muscles are: Below are five general characteristics of muscle cells. Describe each characteristic in your own words. 3. excitable (or responsive) conductive extensible contractile elastic cells B. MUSCLE TISSUE Fill in the table below comparing the three types of muscular tissues Name of type of muscular tissue Cell shape (short/long/branched...) Striated7 (YN) 146

Explanation / Answer

Ans. A)

1. The organs of muscular system are skeletal, smooth and cardaic muscles that carry out main functions of this organ system and tendons that connects muscles to bone.

A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments; both are made of collagen. Ligaments join one bone to another bone, while tendons connect muscle to bone.

2.) Functions of muscles are -

The main function of the muscular system is movement. Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular system's second function: the maintenance of posture and body position.

3.) Characteristics of muscle cells-

a. Excitable - this means that muscles can be stimulated by chemical signals, nerves and stretch.

b. Conductive - this means that the signal for a muscle to contract is spread from the point of stimulation throughout the entire muscle.

c. Extensible - This means ability of a muscle and muscle cell to be stretched.

d. Contractile - this means ability of the muscle to shorten.

e. Elastic cells - this signifies ability of muscle to return to normal size & shape after being stretched.

B.)

Name of type of muscle tissue cardaic muscles skeletal muscles smooth muscles Cell shape cylindrical and branched cylindrical fusiform Straited yes yes no No. of nuclei uninucleate and central multinucleated and peripheral Uninucleate and central Location in body heart attached to bones digestive system, blood vessels. Function pumping of blood through the heart movement of the skeleton control movement of food and fluids through gastrointestinal tract, determine diameter of blood vessels. Control involuntary voluntary control Involuntary

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