______ are circular and biconcave for easy passage through blood capillaries and to transport oxygen.
Red blood cells
The correct answer is Red blood cells.
Red blood cells, also known as erythrocytes, are specialized cells crucial for oxygen transport in the circulatory system. Their unique structure is perfectly adapted to this function. Their circular, biconcave shape (like a flattened donut) increases their surface area relative to their volume. This maximizes the efficiency of oxygen uptake and release. The flexibility of this shape also allows them to easily navigate the narrow capillaries, the smallest blood vessels, ensuring oxygen delivery to all tissues.
Let's look at why the other options are incorrect:
- Guard cells: These are plant cells responsible for regulating gas exchange in leaves, not oxygen transport in blood.
- White blood cells: These are part of the immune system and fight infections; they don't have the biconcave shape optimized for oxygen transport.
- Nerve cells: These transmit electrical signals throughout the body and have a completely different structure and function.
Similar Questions
Identify a structure that plays a role in motility.
Identify another name of Choanocytes.
- In the lac operon model, what is the primary role of the allolactose molecule?
- Identify the correct pairing between a plant hormone and its primary physiological function:
- Which of the following is a characteristic feature of meristematic tissues in plants?
Identify a structure found in the form of vesicles, tubules and lamellae.
Choose the INCORRECT statement about lichens.
Who among the following was the first to describe the nucleus as a cell organelle?
- __________ are amoeboid (amoeba like movement, with pseudopodia) that can squeeze out through capillary walls.
- Choose the correct statement.
Important Questions from Biology
Tooth decay starts when the pH of our mouth is_______.
Which hormone is secreted by the pituitary gland?
Mushrooms and other microorganisms feed on dead plant and animal tissues and convert them into ______
Gregor Johann Mendel came up with the theory of inheritance by studying:
Red algae are generally found in:
