Which Layer Consists Mainly of Elastic Fibers and Smooth Muscle

question 32

Multiple Choice

Which layer consists mainly of elastic fibers and smooth muscle fibers that extend circularly around the lumen?

• A) A
• B) B
• C) C
• D) A and B
• E) A, B, and C

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Definitions:

Proximate Or Ultimate

Causes explaining behaviors: "proximate" refers to the how (mechanisms behind it), "ultimate" refers to the why (evolutionary purpose).

Natal Nests

The original nests or birthplaces where animals are born and initially raised, often important for species with homing instincts or territorial behaviors.

Brood Parasitism

A reproductive strategy where one species lays its eggs in the nest of another species, leaving the host to incubate and rear the parasitic offspring.

Mate Guarding Hypothesis

A theory explaining certain behaviors intended to prevent sexual access to one’s mate by competitors, ensuring paternity certainty.