W1 2(a) Level of organisation

Define the term "tissue". (2 marks)

• M1: (a group of) similar / same cells / same type;

• M2: (that) carry out the same / specific / one / certain function;

Define the term "organ". (1 mark)

M1: several / different tissues carrying out a / one / particular function / purpose;

Identify the organ responsible for each of the following functions. (5 marks)

• Pumps blood:

• Forms oxyhaemoglobin:

• Stores urine:

• Secretes oestrogen:

• Forms sperm:

• M1 Pumps blood: heart;

• M2 Forms oxyhaemoglobin: lung(s);

• Stores urine: bladder;

• Secretes oestrogen: ovary / ovaries;

• Forms sperm: testis / testes / testicles;

Describe the levels of organisation within an organism. (3 marks)

• M1: organelles are found inside cells;

• M2: cells make up tissues;

• M3: tissues make up organs and organs make up systems;

Explain why an organ system is more complex than an organ. (2 marks)

• M1: (an organ system) consists of several / different organs;

• M2: (that) work together to perform a major body function / e.g., the digestive system breaks down and absorbs food;