Which of the following does not control heart beats?

Options

A. Vagus
B. Epinephrine
C. Norepinephrine
D. Glossopharyngeal nerve

Answer

To solve the question "Which of the following does not control heart beats?" we will analyze each of the provided options one by one.

### Step 1: Understand the options
The options given are:
1. Vagus nerve
2. Epinephrine
3. Norepinephrine
4. Glossopharyngeal nerve

### Step 2: Analyze the Vagus Nerve
The vagus nerve is a crucial part of the autonomic nervous system. It plays a significant role in regulating heart rate. Specifically, the vagus nerve decreases the heart rate by releasing acetylcholine, which acts on the heart's pacemaker cells.

**Hint:** The vagus nerve is known for its role in decreasing heart rate.

### Step 3: Analyze Epinephrine
Epinephrine, also known as adrenaline, is a hormone released during the "fight-or-flight" response. It increases heart rate and the force of heart contractions, thereby increasing blood pressure.

**Hint:** Epinephrine is associated with increasing heart rate during stress.

### Step 4: Analyze Norepinephrine
Norepinephrine, or noradrenaline, is another hormone involved in the "fight-or-flight" response. It primarily acts to constrict blood vessels and can also increase heart rate, although its primary role is more about increasing blood pressure.

**Hint:** Norepinephrine can also increase heart rate, but it is more about blood vessel constriction.

### Step 5: Analyze the Glossopharyngeal Nerve
The glossopharyngeal nerve is primarily responsible for functions related to the throat, including taste and swallowing. It does not have a direct role in controlling heartbeats.

**Hint:** The glossopharyngeal nerve is not involved in heart rate control; it deals with throat functions.

### Conclusion
After analyzing all the options, we conclude that the **glossopharyngeal nerve** does not control heartbeats. Therefore, the correct answer is the glossopharyngeal nerve.

### Final Answer
**The correct option is the glossopharyngeal nerve.**