(A) Hydra (B) Grasshopper (C) Earthworm Has no circulatory system

Name: Problem 4, Chapter 5: SAT Biology E/M
Uploaded: 2020-05-14T14:37:20-08:00
Duration: 2 min 9 s
Channel: Morgan Schnars
Description: (A) Hydra (B) Grasshopper (C) Earthworm Has no circulatory system

step 1 So the question asks which of these three organisms does not have a circulatory system? And we'r

(A) Hydra (B) Grasshopper (C) Earthworm ...

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Key Concepts

Diffusion as a Transport Mechanism

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. It serves as an alternative to a circulatory system in small or simple organisms, allowing for the exchange of gases, nutrients, and wastes across cell membranes. This mechanism is crucial in understanding how organisms without specialized transport systems can maintain cellular functions.

Circulatory System

The circulatory system is a network that transports nutrients, gases, hormones, and wastes throughout an organism's body. It ensures proper exchange of materials between cells and can be classified as either an open system, where the fluid directly bathes the organs, or a closed system, where the blood or hemolymph circulates within vessels. This concept is essential in understanding how various organisms maintain homeostasis.

Animal Body Organization

Animal body organization describes the structural complexity of an organism and includes the arrangement of tissues and organs. Some animals have complex organ systems, while others, particularly simpler invertebrates, lack certain systems such as a circulatory system, relying instead on processes like diffusion for material exchange. This concept is fundamental to comparative biology and evolutionary studies.

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