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What are the three layers of skin?
- -Subcutaneous (hypodermis)
What and where are the arrector pili muscles located?
What- Smooth muscles that cause hairs in skin to stand up
Located- in dermis
What are the subaceous glands?
Oil glands. Secrete oil via canal to lubricate skin
How many years ago did human begin become hairless?
What are the functions of the skeletal system?
- -Support and protect ex. head protects brain
- -Mineral Homeostasis
- -Blood Cell production
- -Triglyceride, salt and storage
What two parts are the skeletal system broken down into?
axial skeleton- skull, vertebral column and ribs
appendicular skeleton- appendages (arms/legs)
What is the difference between bone and cartilage?
Bone- mineralized, and vascular
Cartilage- flexible, a vascular, covers articluar surfaces
What is the periosteums function?
Lilnes external bone surfaces, bone maintenance (creates new bone)
What is compact bone?
Very dense bone, cells are still living, located in middle of bones
What is spongy bone?
Located more at the ends of bones. Have trabeculae.
What is the Medullary Cavity?
Found in long bones usually filled with yellow bone marrow.
Filled with red bone marrow during blood cell formation.
What are the different types of bones?
- -Long bones: only bones that have medullary cavity
- -Short bones: no medullary cativity; have spongy bone
- -Flat bones
- -Irregular bones: bones in face
- -Sesmoid bones: form within tendons. Provide mechanical advantage to tendons.
Functions of muscle tissue?
- -producing body movement
- -stabilizing body positions
- -regulating organ volume
- -moving substances within the body
- -producing heat
What is skeletal muscle?
- Striated, voluntary muscle that connets:
What is cardiac muscle?
Involuntary, striated muscle found in walls of heart
What is smooth muscle?
Involuntary muscle found around hollow organs
In the cardiovascular system what do blood and its components do?
Carry nutrients, oxygen and waste products to and from cells
seperate body into top and bottom
separates body in to right and left
nearer to head
ex. heart is superior to stomach
nearer to feet
ex. stomach is inferior to heart
nearer to front
ex. sternum is anterior to heart
hearer to back
ex. kidneys are posterior to intestines
nearer to midline
ex. fifth digit (pinky finger) is on medial side of hand. Or medial to the first digit (thumb)
farther (away) from midline
ex. first digit (thumb) is on lateral side of hand or lateral to fifth digit.
nearer to trunk or point of orgin
ex. elbow is poximal to wrist; proximal part of artery is its beginning
farther from trunk or point of orgin
ex. wrist is distal to elbow; distal part of lower limb is foot
nearer to or on surface
ex. muscles of arm are superficial to its bone
farther from surface
ex. humerus is deep to arm muscles