Which of the following animals has a closed circulatory system? A. Insects B. Earthworms C. Jellyfish D. Sponges 相关知识点: 试题来源: 解析 B。蚯蚓具有封闭的循环系统。昆虫(选项 A)通常具有开放式循环系统;水母(选项 C)和海绵(选项 D)的循环系统也不是封闭的,所以答案是 B。
1. 为什么生物要使用循环系统 在大型生物中, 表面积与体积的比率不够大, 无法单独扩散, 无法向需要的细胞提供氧气、葡萄糖和其他分子等物质。因此, 使用循环系统(circulatory system)。 2. Common features of a circulatory system •适宜的媒介(medium)--在哺乳动物中, 运输媒介是血液。它是以水为基础的, 所...
A closed circulatory system is a system where the blood always moves inside of blood vessels, through a series of arteries, capillaries, and veins. In... See full answer below.Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our exp...
Circulatory System - A Laboratory Guide to Frog Anatomy - CHAPTER 5ELSEVIERA Laboratory Guide to Frog Anatomy
Nowadays the importance of RV has been recognized, and its role in the cardiac hemodynamics has been highlighted7,8. Actually, the circulatory system is a closed-loop where the function of both ventricles is crucial. Therefore, not infrequently, impairment of one of the two ventricles ...
在大型生物中,表面积与体积的比率不够大,无法单独扩散,无法向需要的细胞提供氧气、葡萄糖和其他分子等物质。因此,使用循环系统(circulatory system)。 2. Common features of a circulatory system ?适宜的媒介(medium)--在哺乳动物中,运输媒介是血液。它是以水为基础的,所以物质很容易溶解在里面。?移动媒介的手段...
covers the endoderm in front and laterally, where it becomes gradually narrower to end adjacent to the first somite. Gastrulation begins during CS8 (~23 days of the development;14). By CS9, Hensen’s node, which localizes gastrulation, is found at the caudal end of the columns of somi...
Since the circulatory system is a closed loop, cardiac output and venous return are equal. 我们稍微简化一下:一段时间内,任一心室泵出的血液量称为心输出量。静脉将血液送回到心房的速度叫做静脉回心血量。这个很容易记,由于循环系统是闭环,心输出和静脉回流是相等的。 Okay, so let's use some numbers...
Closed circulatory systems underlie the function of vertebrate organs, but in long bones their structure is unclear although they constitute the exit route for bone marrow (BM) leukocytes. To understand neutrophil migration from BM, we studied the vascular system of murine long bones. Here, in a...
This paper investigates some nonlinear third-order ordinary differential equations and inclusions with anti-periodic type integral boundary conditions and multi-strip boundary conditions. To establish the existence results for the given problems, we appl