heart rate
Definition
Heart rate is the number of times your heart beats per minute. It is measured in beats per minute (BPM).
Heart rate is controlled by the autonomic nervous system. The autonomic nervous system has two branches: the sympathetic nervous system and the parasympathetic nervous system.
The sympathetic nervous system is responsible for the fight-or-flight response. When you are in a stressful situation, the sympathetic nervous system increases your heart rate to prepare you to fight or flee.
The parasympathetic nervous system is responsible for the rest-and-digest response. When you are relaxed, the parasympathetic nervous system slows your heart rate down.
Heart rate can also be affected by factors such as age, exercise, and medication.
A normal heart rate for a resting adult is between 60 and 100 beats per minute. However, heart rate can vary depending on age, exercise, and medication.
A heart rate that is too high or too low can be a sign of a heart problem. If you have any concerns about your heart rate, you should see a doctor.
How can the word be used?
The athlete's heart rate was elevated after the race.
Different forms of the word
Noun: heart rate.
Adjective: heart-rate.
Adverb: heart-rate-wise.
Verb: heart-rate.
Etymology
The word "heart rate" comes from the Old English words "heorte", which means "heart", and "ræden", which means "rate". The word "heart" has been used in English since the 7th century, and the word "rate" has been used in English since the 14th century. The two words were combined to form the word "heart rate" in the 19th century.
Question
What happens when you heart rate is increased?
AQA Science Exam Question and Answer
Question:
Explain the factors that can influence heart rate and how changes in heart rate help regulate blood flow and oxygen delivery during physical activity.
Answer:
Heart rate, the number of times the heart beats per minute, is influenced by various factors. One primary factor is the body's demand for oxygen and nutrients. During physical activity, muscles require more oxygen to produce energy, prompting the heart to pump blood faster to meet this demand. Emotions like stress or excitement can also affect heart rate through the autonomic nervous system.
Changes in heart rate play a crucial role in regulating blood flow and oxygen delivery. As physical activity increases, the heart rate rises, pumping more oxygenated blood to muscles and other tissues. This process supports energy production and helps remove waste products like carbon dioxide. Conversely, when at rest, the heart rate decreases, conserving energy while maintaining essential functions.
The heart rate's ability to adapt to varying demands ensures a balance between oxygen supply and demand. Efficient heart rate regulation enhances cardiovascular fitness, improves overall endurance, and contributes to a healthier circulatory system. Understanding the dynamic relationship between heart rate, physical activity, and oxygen delivery underscores the body's remarkable capacity to maintain homeostasis and respond to changing needs.