Question

which type of muscle constricts veins when blood pressure drops suddenly?
striated
smooth
cardiac
halversian
sarcoplasm
question 10
the ability to extend a leg originates from
contraction of ligaments
contraction of a muscle
lengthening of a muscle
contraction of tendons
combination of push and pull by antagonistic muscle pairs
section: 33.3 blooms: knowledge
question 11
during skeletal muscle contraction, myosin cross bridges attach to active sites of:
z discs
actin filaments
myosin filaments

Explanation:

• For the first question, smooth muscle lines the walls of veins and can constrict them in response to changes like a sudden drop in blood - pressure.
• For the second question, the extension of a leg is due to the coordinated action of antagonistic muscle pairs. One muscle contracts while its antagonist relaxes to produce movement.
• For the third question, during skeletal muscle contraction, myosin cross - bridges attach to active sites on actin filaments to generate force.

Answer:

• Question 1: B. Smooth
• Question 10: E. combination of push and pull by antagonistic muscle pairs
• Question 11: B. actin filaments