Given These Events: 1) Calcium Ions Move Along Their Concentration

question 17

Multiple Choice

Given these events: 1) calcium ions move along their concentration gradient
2) action potential in cell membrane
3) opening of ion channels in sarcoplasmic reticulum
4) action potential in T tubules
5) actin to myosin cross-bridges form
Arrange them in the correct sequence as they participate during skeletal muscle contraction.

• A) 1, 2, 5, 3, 4
• B) 1, 5, 4, 3, 2
• C) 2, 4, 3, 1, 5
• D) 2, 1, 5, 3, 4
• E) 5, 3, 4, 2, 1

---

Definitions:

Hormones

Chemical messengers secreted by glands in the body, responsible for regulating physiological processes including growth, metabolism, and mood.

Endorphins

Natural chemicals produced in the brain that interact with opioid receptors to reduce perception of pain and boost feelings of pleasure or contentment.

Hallucinogenic Drugs

Psychoactive substances that cause alterations in perception, mood, consciousness, and cognition, often inducing experiences disconnected from reality.