1. List the three sources of energy that muscles use during contraction. Which one is the...

1.creatine phosphate, muscle glycogen, stored atp

More efficient is Stored ATP

Least efficient :creatine phosphate

2.muscle contracts when myosin shift, but lack of ATP prevent it from detaching, the muscle remains contracted, so all muscle of body become rigid

3.steps of muscle contraction

A nerve muscle impulse travels down an axon and causes the release of acetyle choline - - - - >the sliding of myofibrils draws z line together, sarcomere shorten, muscle fibers contract. (nerve stimulation--->ca2++ released from sarcoplasmic reticulum--->formation of strong binding state--> cross bridge movement begins---->cross beidge movement comoleted(myosin no longer locked)--> ATP binds to cross bridge. Formayiin of weak binding site.

4.it determined by absence or presence of two antigen A, B

Group A, Group B, Group AB, Group O

Universal receiver Group AB+

If o positive then receive from o+ o-

If A positive then receives from A+ A- O+ O-

If B postive the receives from B+ B- O+ O-

If AB postive then receives from ALL BLOOD TYPES

Universal donor:Group O-

5.blood contains plasma, RBC, WBC, platelets

Plasma contains water, salt, protein

6.at pacemaker cell:depolarising current carried by cell primarily by relatively slow ca2++ current instead of fast Na++ current

At contractile cardiac cell likely same as pacemaker cell

Skeletal muscle:more k+ on inside than outside.