A&P exam 2

The skin plays a role in the manufacture of vitamin ________. 

• A

• B

• C

• D

Which three pigments contribute to skin color?

• 1. Carotene, melanin, hemoglobin

• Keratin, melanin, hemoglobin

  
  

• 1. Melanin, keratin, hemoglobin

• 1. Hemoglobin, carotene, keratin

A group of concentric rings of bone matrix, comprising the functional unit of long bones, is called a(n) ___________.

• 1. lamella

• 1. osteon

• 1. pillar system

• 1. Sharpey's system

At what age are nearly all bones completely ossified and skeletal growth ended?

• 18

• 21

• 25

• 28

Calcium's homeostatic importance to the body is primarily _____________.

• 1. to strengthen bone

• 1. 
     

  2. to function in numerous metabolic activities (muscle contraction, blood coagulation)

  
  

• 1. to whiten our teeth

• both a and c

Which of the following is NOT a factor that stabilizes joints?

• Articular surface

• 1. Muscle tone

• 1. Bursae

• 1. Ligaments

Which of the following synovial joint components is responsible for secreting synovial fluid?

• articular cartilage

• synovial cavity

• articular capsule

• synovial membrane

Corpses usually exhibit rigor mortis because ______________.  

• 1. ATP hydrolysis is stimulating myosin head attachment to actin

• 1. lack of ATP hydrolysis prevents myosin head detachment from ac

• 1. calcium stores become deficien

• 1. sodium stores become deficient

This type of synovial joint is used when you bend your fingertips to hand onto a cliff.

• plane

• hinge

• pivot

• condyloid

What would happen to intracellular calcium levels if a skeletal muscle fiber were treated with a calcuim channel-blocking drug that acts only on the SR?

• 1. Intracellular calcium levels would increase.

• 1. Intracellular calcium levels would decrease.

• 1. Intracellular calcium levels would be unchanged

• 1. The muscle fiber would shrink