Question

Draw a labelled diagram of a human sperm.

Hint:

Sperm = Head (nucleus + acrosome) + Middle piece (mitochondria) + Tail (movement).

Answer 1

A human sperm is a haploid male gamete responsible for fertilization. It has four main parts: head, neck, middle piece, and tail. \begin{center} \begin{tikzpicture}[scale=1.2] % Head \draw[thick] (0,0) ellipse (0.4 and 0.8); \node at (0,-0.9) {Head}; \node at (0,0) {Nucleus}; % Acrosome \draw[thick, fill=gray!20] (0,0.8) arc (0:180:0.4 and 0.2); \node at (-0.6,0.9) {Acrosome}; % Neck \draw[thick] (0,-0.8) -- (0,-1.0); \node at (0.6,-0.9) {Neck}; % Middle piece \draw[thick] (0,-1.0) -- (0,-2.5); \draw[decorate,decoration={brace,amplitude=5pt}] (0.2,-1.0) -- (0.2,-2.5); \node at (1.0,-1.7) {Middle piece (mitochondria)}; % Tail \draw[thick] (0,-2.5) -- (0,-5); \node at (0.7,-3.8) {Tail}; \end{tikzpicture} \end{center} Explanation:
- Head: Contains nucleus with haploid chromosomes; acrosome has enzymes to digest egg coverings.
- Neck: Connects head and middle piece.
- Middle piece: Rich in mitochondria for energy (ATP) to power movement.
- Tail: Provides motility to reach the egg.