LEC extra credit

A&P ch 9 & 10

Why are Eye Muscles are Fastest Quiz

Which term is used for the clear area on the anterior surface of the eye?

Cornea

Which of the following muscles adducts the eye?

Medial rectus

The ability of the extraocular eye muscles to hold the eye steady for long periods of time is due to their having

slow-twitch oxidative muscle fibers

The ability of the extraocular eye muscles to perform small fine movements is due to having

small motor units

Dead Body Myths You Shouldn't Believe Part 2

When a muscle is relaxed myosin heads are prevented binding to actin by ______________.

the troponin-tropomyosin complex

Muscle contraction is initiated by calcium released by the ___________.

sarcoplasmic reticulum

Muscle contraction occurs when individual units called ____________ shorten.

sarcomeres

The thick filament of the sarcomere is composed of 1 and the thin filament is mostly composed of 2

1. myosin

2. actin

How Muscles Change With Exercise : Match the characteristic to the muscle fiber type.

• Large number of capillaries

• Small diameter fibers

Slow-twitch muscle fibers

• Lower number of mitochondria

• Low resistance to fatigue

Fast-twitch muscle fibers

Adaptations of slow-twitch muscle fibers to exercise except

an increase in fiber diameter

In the presence of oxygen a single molecule of glucose can be use to produce 1 ATP while in the absence of oxygen 2 ATP are produced.

1. 32

2. 2

What Are Hernias?

The two most common contributing factors to development of a ventral hernia are

pregnancy and central obesity

Which of the following statements about groin hernias is correct?

Groin hernias occur at naturally occurring weak places in the inguinal ligament

An epigastric hernia occurs along the 1. in the area 2 .

1. linea alba

2. above the umbilicus

A 1 hernia may not require treatment while a 2 hernia usually requires surgery.

1. reducible

2. incarcerated