Question

In: Anatomy and Physiology

Direction of fiber / muscle contraction: ( LEFT, RIGHT, UP, OR DOWN ) Masseter & temporalis...

Direction of fiber / muscle contraction: ( LEFT, RIGHT, UP, OR DOWN )

Masseter & temporalis
Lateral rectus (of the eye)
Sternocleidomastoid
Rectus abdominus
Multifidi
Trapezius
External oblique & internal oblique (one on the right and one on the left)
Pectoralis major
Deltoid
Latissimus dorsi

Expert Solution

Direction of muscle fibre are usually will be in the direction of orgin to insertion

1)Masseter and temporalis - DOWN

This are the muscle used for the mastication. it is directed downward in the body

2) Lateral Rectus

Lateral rectus is used for the abduction of the eye

Lateral rectus of the right eye muscle fibre are directed to RIGHT

Lateral rectus of the left eye muscle fibre are directed to LEFT

3) RECTUS ABDOMINIS - UPWARD

rectus abdominis muscle is orginating from the pubic symphysis and inserted in to the 5, 6, 7 costal cartilage and xphoid process

4) multifidi muscle - DOWNWARD

multifidus muscle orginate from the superior articular surface of the c4 - c7 vertebrae and inserted to the spine of c 4 to c7 vertebrae

5) TRAPEZIUS - Downward

6) external oblique of the right side - LEFT (INWARD AND OBLIQUE)

Internal oblique of the left side - LEFT ( OUTWARD AND OBLIQUE)

7) PECTORALIS MAJOR ON THE RIGHT SIDE - RIGHT

PECTORALIS MAJOR ON THE LEFT SIDE - LEFT

8) DELTOID - DOWNWARD

9)LATISSIMUS DORSI RIGHT SIDE - RIGHT

LATISSIMUS DORSI LEFT SIDE - LEFT

Sydney Mullin answered 1 year ago

What is the direction of the fiber / muscle contraction: ( LEFT, RIGHT, UP, OR DOWN...

What is the direction of the fiber / muscle contraction: ( LEFT, RIGHT, UP, OR DOWN ) Supraspinatus, infraspinatus & teres minor (three of the four rotator cuff muscles) Biceps brachii & pronator teres Triceps brachii Extensor digitorum, extensor carpi ulnarus & extensor retinaculum Gluteus maximus & gluteus medius Adductor longus Rectus femoris Hamstrings: biceps femoris, semitendinosus & semimembranosus Gastrocnemius Tibialis anterior

What are the muscle fiber types, contraction types, and the energy sources utilized by muscle fibers?

Skeletal muscle has a defined contraction period, causing the full contraction of every stimulated fiber. (8...

Skeletal muscle has a defined contraction period, causing the full contraction of every stimulated fiber. (8 pts) Part 1 - What determines the length of time during which the fiber contracts? Part 2 - What ends the contraction, so relaxation can begin? (not including the termination of the NMJ stimulation) Part 3 - Taking the previous two parts, and now adding in that the NMJ has stopped inducing depolarizations at the motor end plate, describe the events as the contraction...

Describe the process of excitation-contraction coupling in a skeletal muscle fiber, starting at the very beginning...

Describe the process of excitation-contraction coupling in a skeletal muscle fiber, starting at the very beginning and working your way to the end of the process. Make sure you discuss all relevant steps in the correct order.

Up Down Left Right Net Sales Revenue $ 1,080,000 $ (d) 1,642,500 $ (j) Variable cost...

Up Down Left Right Net Sales Revenue $ 1,080,000 $ (d) 1,642,500 $ (j) Variable cost (a) 100,000 1,314,000 143,100 Fixed Cost (b) 240,000 118,000 (k) Operating income (loss) $ 87,000 $ (e) $ (g) 82,600 Units Sold 180,000 16,000 (h) (I) Contribution Margin per unit $ 3.00 $ (f) $ 73.00 $ 18.00 Contribution Margin Ratio ( c) 80% (i) 40% Net Sales Revenue 1,080,000 Variable costs ____________ Fixed costs ____________ Operating income (loss) 87,000 Units sold 180,000 Contribution...

As the resistance (load) to muscle contraction increased, what happened to the velocity of muscle contraction?...

As the resistance (load) to muscle contraction increased, what happened to the velocity of muscle contraction? a) it increased b) it stays the same c) it increased dramatically and then leveled off d) it decreased 2) how is wave summation achieved in vivo (that is, in the living muscle)? a) by decreasing the amount of potassium b) by increasing the strength of a neuron’s action potential c) by increasing the frequency of neuron firing d) by myelinated great the neuron

what is the of the muscle spindle in controlling muscle contraction

Explain the molecular regulation and mechanism of muscle contraction. Start with an action potential moving down...

Explain the molecular regulation and mechanism of muscle contraction. Start with an action potential moving down a T-tubule and end with relaxation following a contraction. Your answer should include details of specific cellular features, molecules, ions, and their interactions to the extent that we covered it in class. Assume that we understand the basic structure of a sarcomere so that you don’t have to describe the overall structure in your response.

Angular work is positive during eccentric muscle contraction and negative during concentric muscle contraction. With the...

Angular work is positive during eccentric muscle contraction and negative during concentric muscle contraction. With the aid of sketches, explain the reason for work to be positive and negative for eccentric and concentric muscle actions, respectively.

Describe the process of skeletal muscle contraction starting from an action potential being sent down a...

Describe the process of skeletal muscle contraction starting from an action potential being sent down a motor neuron to the contraction of the sarcomere.