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Flashcards in Bones & Muscles Deck (30):
1

Name the 2 divisions of the skeleton.

Axial and Appenducular

2

What is red marrow composed of?

Blood Cells: RBCs, WBCs & Platelets

3

These are the 2 types of protein fibers found in muscles.

Actin & Myosin

4

Name 5 functions of bone.

Store Minerals
Form Blood Cells
Protection of Organs
Support & Framework of Body
Assist in Movement

5

This is the name of the very dense, non-porous type of bone.

Compact

6

The skull, vertebrae & rib cage all belong to this skeleton.

Axial

7

These muscle filaments are very thin & are important to muscle contraction.

Actin

8

What is ossification?

The hardening of bone.

9

List 2 general types of joints.

Immovable & Movable

10

These connect muscles to bone.

Tendons

11

Name 2 types of movable joints.

Freely & Slightly movable

12

These thick fibers contain cross-bridges & are important in muscle contraction.

Myosin

13

This is the thin covering surrounding compact bone.

Periosteum

14

These are the "tunnels" running through compact bone.

Haversian Canals

15

When does ossification begin & end?

Begins as an embryo & ends in late teens - early twenties.

16

True or False: Spongy bone is squishy.

False: it is porous, but solid.

17

Name 3 types of muscles.

Smooth, Cardiac, & Skeletal

18

These connect bone to bone.

Ligaments

19

This type of muscle is striated with multiple nuclei per cell. It is attached to bone.

Skeletal

20

This is the name of the neurotransmitter released by neurons that begins the process of contraction.

Acetylcholine

21

This type of muscle has no striations.

Smooth

22

This type of muscle is only found in the heart.

Cardiac

23

This is what muscles release in response to acetylcholine.

Calcium ions

24

This type of muscle is found in organs like the stomach, eyes, blood vessels, and digestive tract.

Smooth

25

The humerus, femur and pelvis all belong to this skeleton.

Appendicular

26

During contraction, cross-bridges do this.

Bend, pulling actin & myosin together.

27

The type of joint found in your shoulder & hip.

Ball & Socket

28

During relaxation, neurons release this.

Acetylcholinesterase

29

Name 4 steps of muscle contraction.

1. Brain sends motor impulse
2. Neuron releases acetylcholine.
3. Muscles release Ca++ ions.
4. Cross-bridges bend, pulling actin & myosin together.q

30

Name 4 steps of muscle relaxation.

1. Brain releases motor impulse.
2. Neuron releases acetylcholinesterase.
3. Ca++ ions are reabsorbed.
4. Cross-bridges straighten, and actin & myosin slide AWAY from each other.