In class, it was discussed different ways that muscle fibers and muscles as a whole can...

In class, it was discussed different ways that muscle fibers and muscles as a whole can increase the strength of a contraction. Please list three different things that a muscle fiber or a muscle as a whole can do to increase tension/strength and explain them.

Expert Solution

a) The force -length relationship states that muscles generate the greatest force when at their resting (ideal) length, and the least amount of force when shortened or stretched relative to the resting length. By increasing the resting length of sarcomere we increase the distance that the filaments (actin and myosin) can slide over each other, this develops force or tension.

b) Force generated by a muscle depends upon the total number of cross bridge attached, a larger number of cross-bridges results in a larger amount of force. There is a inverse relationship between force and velocity, At a maximum velocity no cross-bridges can form so no force is generated, conversely as muscle velocity decreases more cross bridge have time to attach and to generate force, thus force increases.

c) Motor unit recruitment, which is a a measure of how many motor neurons are activated in a particular muscle, and therefore is a measure of how many muscle fibers of that muscle are activated. The more or higher is the recruitment stronger will be the muscle contraction.

Sydney Mullin answered 1 year ago

In what ways are autorhythmic fibers similar to and different from contractile fibers?

In class, we discussed different ways to calculate the return or yield on a money market...

In class, we discussed different ways to calculate the return or yield on a money market financial instrument. We started with Holding Period Return (simple interest) and worked through Bank Discount Yield, Money Market 360-day Yield, Money Market 365-day Yield, and APY. (Formulae provided, below.) We showed that using the same inputs for current price and maturity value, you could get different answers for each quotation method. Explain the three issues behind why the quotation methods yield different results. ...

Why does acetylcholine excite skeletal muscle fibers but inhibit cardiac muscle fibers?

actions of these muscles Muscle

actions of these muscles Muscle origin insertion action Latissimus dorsi Spinous processes of T7 thru L5, lower 3 ribs, iliac crest Rhomboids Spinous processes of C7 thru T5 Diaphram External intercostals Internal Intercoatals Triceps brachii Long head: inferior margin of glenoid cavity Lateral head: posterior humerus Medial head: distal radial groove of post. humerus Biceps brachii Short head: coracoid process Long head: supra-glenoid tubercle Brachioradialis Flexor Digitorum Longus

1. What are the typical types of fibers in these muscles, how are these fibers organized...

1. What are the typical types of fibers in these muscles, how are these fibers organized and how does this architecture affect your selected movement from a functional perspective? (for runner muscles ) 2.How is the mechanical behavior of a single muscle fiber in tension different from the whole muscle? What is the functional value? (for runner muscles ) 3.5. Do your selected muscles cross more than one joint? What are disadvantages associated with muscles that cross more than one...

actions of these muscles. Muscle &nb

actions of these muscles. Muscle origin insertion action Rectus femoris (one of quadriceps muscles) anterior inferior iliac spine and superior margin of acetabulum patella and tibial tuberosity via patellar ligament Gluteus maximus dorsal ilium, sacrum and coccyx gluteal tuberosity of femur Semimembranosus ischial tuberosity medial condyle of tibia; via ligament to lateral condyle of femur Semimembranosus Biceps Femoris and Brachailis Brachioradialis Gracilis inferior ramus and body of pubis medial surface of tibia, just inferior to medial...

Skeletal muscle fibers can be classified according to the predominant type of metabolism that the fiber...

Skeletal muscle fibers can be classified according to the predominant type of metabolism that the fiber relies on to produce energy needed for muscle contraction. List the 3 metabolic systems that skeletal muscle fibers rely on to produce energy for immediate use, short-term use, and longer-term use:

actions of these muscles . muscle origin &nb

actions of these muscles . muscle origin insertion action Sternocleidomastoid Manubrium and medial portion of clavicle When both contract: When one contracts: Erector Spinae Serratus Anterior Pectoralis major Clavicle, sternum, and costal cartilage of first six ribs deltoid Lateral third of clavicle; acromion and spine of scapula Trapezius Occipital protuberance and spinous processes of C7 thru T12 Action on scapula: When scapula is fixed:

Muscles of the abdomen and back Muscle Origin &nbsp

Muscles of the abdomen and back Muscle Origin Insertion Action External Oblique Internal Oblique Rectus Abdominis Transverse Abdominis Quadratus Lumborum Ilio-Psoas

If muscle myosin is non-processive, then how is it that we can contract our muscles and...

If muscle myosin is non-processive, then how is it that we can contract our muscles and hold them that way for a sustained period of time? That is, how can our muscles resist a counter force (for example a heavy object) and contract continuously when we lift it despite the fact that the motor protein, myosin II, is non-processive?

Question