Which of the following statements about circulatory systems is true?
گردشی نظام کے بارے میں مندرجہ ذیل میں سے کون سا بیان درست ہے؟
- All invertebrates have an open circulatory system
- Hormones are transported in the blood
- The systemic circulation carries blood to and from the lungs
- Capillaries have thicker walls than veins do
Explanation
Hormones are chemical messengers that travel through the bloodstream to target organs and tissues.
This is a key function of the circulatory system, helping regulate various bodily functions.
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