Which of the following is not true of elastic filaments?
A. They run through the core of thin myofilaments.
B. They are composed of titin.
C. They attach to Z discs.
D. They help to stabilize thick myofilaments.
E. They prevent overstretching of muscle fibers.
Answer: A
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In the elastic arteries, which of the tunics have elastic fibers?
A. Tunica intima B. Tunica externa C. Tunica media and tunica externa D. Tunica media E. Tunica media, tunica intima, and tunica externa
Which are differences between cardiac muscle tissue and skeletal muscle tissue?a: The sarcoplasmic reticulum in cardiac muscle is less extensive.b: The sarcoplasmic reticulum in cardiac muscle is more organized.c: Cardiac muscle has intercalated discs; skeletal muscle does not.d: Cardiac muscle has 1 or 2 nuclei per cell; skeletal muscle has multiple nuclei per cell.e: Cardiac muscle has more well defined terminal cisternae.
A. b, d, e B. a, c, d C. b, c, e D. a, b, e E. a, c, e
The most common neurotransmitter is ________.
Fill in the blank(s) with the appropriate word(s).
Cerebrospinal fluid fills the space between the __________.
A. dural sheath and dura mater B. dural sheath and vertebral bones C. dura mater and arachnoid mater D. arachnoid mater and pia mater E. dura mater and pia mater