Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

A runner's heartbeat increases before the race starts. This is mostly related to the effect of which hormone?

Answer and explanation

Correct answer: Adrenaline

Before a race, excitement and anticipation activate the sympathetic stress response. The adrenal glands release adrenaline, which increases heart rate and breathing and directs more blood toward skeletal muscles. These changes prepare the body for rapid action. Insulin regulates blood glucose, while auxin and cytokinin are plant hormones, so they do not explain the runner’s immediate heartbeat increase. Therefore B is correct.

Related tags

AdrenalineHeartbeatEndocrine-ResponseControl And CoordinationWorld Of LivingScienceClass 10 Mcq

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.