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Flashcards in Questions from Hell Test 2 Deck (65)
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1

Are ion channels active/passive?

Passive

2

If you open a Na+ channel in the membrane:
- which way does Na+ flow? (in or out of cell

IN

3

If you open a Na+ channel in the membrane: - does the cell’s membrane potential become more positive, or more negative?

MORE POSITIVE

4

If you open a K+ channel in the membrane:
- which way does K+ flow? (in or out of cell)

out bitch

5

If you open a K+ channel in the membrane:
- does the cell’s membrane potential become more positive, or more negative

More nega-i-tive

6

_______ binds Ca2+ in a muscle fiber.

Troponin

7

_______ covers the myosin-binding sites of actin when muscle fiber is “at rest”.

Tropomyosin

8

The voltage-gated Ca2+ channel is located where (to cause neurotransmitter release): ____________

Axon Terminal of NMJ

9

The ____-gated ___ channel is activated at “threshold”.

Voltage Gaited Na Channel

10

The ACh receptor functions as a ____-gated ___ channel.

ligand(chemically) gaited Ion Channel

11

Where is the ACh receptor is located? (Be as specific as possible in your description so that it is not ambiguous.)

Sarcolemma

12

T/F: Muscle fibers conduct Action Potentials, like neurons.

True

13

What does sarcomere mean?

cytoplasam of muscle fiber

14

fundamental unit of muscle is.....?

sarcomere

15

Classify each as Skeletal, Cardiac, Smooth (unitary), or Smooth (multi-unit). May be true for more than type.

Has sarcomeres

skeletal, cardiac

16

Classify each as Skeletal, Cardiac, Smooth (unitary), or Smooth (multi-unit). May be true for more than type.

Cells are electrically coupled by gap junctions

cardiac,smooth

17

Classify each as Skeletal, Cardiac, Smooth (unitary), or Smooth (multi-unit). May be true for more than type.

Site of Ca2+ regulation is calmodulin

smooth

18

Classify each as Skeletal, Cardiac, Smooth (unitary), or Smooth (multi-unit). May be true for more than type.

Site of Ca2+ regulation is troponin

skeletal, cardiac

19

When muscles burn ATP to do work, which molecule acts as the ATPase?

myosin

20

ATP hydrolysis is needed for which step of the cross-bridge cycle?

cocking of myosin head

21

Order these items from smallest to largest: troponin
Muscle fiber
myosin
Myofibril
sarcomere


troponin
myosin
sarcomere
myofibril
muscle Fiber

22

Which is NOT a component of osteoid?
Glycoproteins
Inorganic Phosphate (Pi)
Ca2+-binding proteins
Collagen fibers

Inorganic Phospate

23

Which cell secretes osteoid?
Osteoclast
Osteocyte
Osteoblast
Osteogenic cell
Both A & B

Osteoblast

24

____________ is secreted in response to hypocalcemia.
Thyroid hormone
Parathyroid hormone
Testosterone
Osteocalcin

Parathyroid

25

Wolff’s Law applies to:
Changes in height of individuals
Appositional growth
Interstitial growth
The epiphyseal plate

appositional growth

26

Which protein covers the myosin-binding sites of actin in the absence of intracellular Ca2+?
Myosin
Tropomyosin
Troponin
Tropism

Tropomyosin

27

In it’s resting state, a neuron has more Na+ _______________.
Intracellularly
Extracellularly

Extracellularly

28

In it’s resting state, a muscle fiber has more Na+ _________________.
A. Intracellularly
Extracellularly

Extracellularly

29

Which type of smooth muscle allows for graded contractions?
Unitary
Multi-unit

multi unit

30

During which phase of the muscle twitch does excitation-contraction coupling occur?
Latency Phase
Contraction Phase
Relaxation Phase

Latency