week 7

Question 1

__________ secrete into the environment via a duct

Answer 1

exocrine

Question 2

________ secrete directly into the bloodstream via exocytosis (polar molecule) or diffusion (non polar)

Answer 2

endocrine

Question 3

there are many types of spiders and as a result many types of __________

Answer 3

webs. There are many types of silk which show the diversity of species

Question 4

__________ extrude the silk via neural intervention

Answer 4

vascularized spinnerette organs

Question 5

____________ is the exocrine gland responsible for web production

Answer 5

aggregate gland

Question 6

___________ bacteria and fungi excrete for preventing the silk from the microbes

Answer 6

aqueous coating

Question 7

spiders often eat their own web as

Answer 7

web production is ver caloric

Question 8

a single thread is made of

Answer 8

protein crystals in Beta pleated sheet imbedded in a residue chain

Question 9

the specific ____________ set the mechanical properties of the web

Answer 9

B sheet crystals and the specific amino acid s

Question 10

silk is ___________meaning that it resists being pulled like

Answer 10

tensile

Question 11

________ shows how much you can stretch something before it breaks

Answer 11

stress strain curve

*silk can go to 20x its length

Question 12

where the strain curve breaks is the location of

Answer 12

max extensibility

Question 13

________ resistance to strain

Answer 13

stiffness

Question 14

_________ change in stiffness

Answer 14

stress

Question 15

____________ change in stretch

Answer 15

modulus

Question 16

spider mix two kinds of silk allowing us to ____________

Answer 16

extend stoping time of the insect

Question 17

a larger x value helps us decrease F stop and mass m which correlated to a larger _________

Answer 17

extensibility

Question 18

exocrine loss is very expensive rat example

Answer 18

Rat food intake increases dramatically with more pups but weight remains constant due to exocrine expense

Question 19

_________ is made of much fibrils

Answer 19

muscle fiber

Question 20

_______ is the site of calcium binding

Answer 20

troponin complex

Question 21

the structural complex is the

Answer 21

troponin complex, actin, tropomyosin

Question 22

the maximum tension occurs where t

Answer 22

thick/thin filament overlap

Question 23

active tension depends on length of activational state is complete. Peak tension can occur during

Answer 23

lengthening or shortening

Question 24

The activation of muscles is dependent on

Answer 24

calcium

ATP is involved in deactivation and activation

Question 25

what happens without ATP

Answer 25

actin remains bound to myosin. rigger mortis

Question 26

steps of muscle contraction

Answer 26

atp is hydrolyzed and phosphate attached to the myosin
actin binds myosin causing release of phosphate
myosin deforms pulling actin
atp can be rehydrolyzed and the process can stat over again

Question 27

the slop fo the line is the

Answer 27

shortening velocity of the muscle

Question 28

the maximum mechanical power occurs at some

Answer 28

arbitrary intermediate.

Question 29

The ________ is structural optimal to deliver calcium

Answer 29

sarcoplasmic reticulum

Question 30

_________from Vm is crucial for mechanical contraction (space of electrical coupling)

Answer 30

Ca diffusion

Question 31

________ is calcium activated fluorescence indicated by changes in calcium

Answer 31

furaptura

Question 32

gulf toad

______ contracts faster than any known muscle and can be used to sing and attract females

Answer 32

swim bladder