Question about Human Body: Circulatory System
Subject Sciences
Sciences
Source Originais Teachy
Originais Teachy
Topic Human Body: Circulatory System
Human Body: Circulatory System
Difficulty Easy
Easy
(Originais Teachy 2024) - Question Easy of Sciences
During a Physical Education class, the 6th-grade students were encouraged to measure their heart rate to better understand how the circulatory system responds to physical exertion. After a brief warm-up, the teacher instructed them to measure their heart rate immediately and then after 5 minutes of moderate aerobic exercise. For this, the students learned to locate the pulse on the radial pulse - located on the wrist, near the thumb - and count the number of beats per minute. Based on this activity and knowledge about the circulatory system, what is the reason why heart rate increases during exercise and how is this related to the function of arteries in the circulatory system?a.
Durante o exercício, a frequência cardíaca aumenta devido à diminuição da produção de adrenalina, que causa uma restrição no diâmetro das artérias, aumentando a pressão arterial e a resistência ao fluxo sanguíneo.
b.
Heart rate increases during exercise because the body demands more oxygen and nutrients, and this is related to the function of arteries that dilate (vasodilation) to increase blood flow and oxygen delivery to the active tissues.
c.
A frequência cardíaca permanece constante durante o exercício, pois o volume de sangue bombeado pelo coração é suficiente para suprir as necessidades de oxigênio dos tecidos em atividade.
d.
A frequência cardíaca diminui durante o exercício para economizar energia, e isso está relacionado à função das veias que se contraem (vasoconstrição) para manter a pressão sanguínea estável.
e.
O aumento da frequência cardíaca durante o exercício é causado pela diminuição do volume sanguíneo, que reduz a resistência ao fluxo de sangue nas artérias, facilitando o trabalho do coração.
Answer sheet:
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